The Plague of Darkness

We’re studying Exodus 10 this morning—the plague of darkness. Before we dive in, let’s set the scene. By this point in the narrative, Pharaoh has witnessed nine devastating plagues. His land has experienced water turned to blood. Frogs have invaded every dwelling. Gnats have swarmed the nation. Flies have brought disease. Livestock have died. Boils have covered both people and animals. Hail has destroyed the crops. Locusts have consumed what remained. And yet, despite all this, Pharaoh’s heart has remained hard. He refuses to release Israel.

Now God announces a tenth plague—but before that final, devastating plague, there comes one more sign. And this sign is instructive because it’s different from the others. It’s not about death or disease or agricultural devastation. It’s about darkness. Thick, palpable darkness. Darkness you could feel.

This raises an immediate question that I want to hold before us for the entire lesson: Why darkness? What does the removal of light accomplish that the other plagues have not? Why would God reach into the natural world and steal the sun itself? The answer, friends, will take us on a theological journey from creation itself all the way to the New Testament. It will teach us about God’s character, about human hardening of heart, about judgment and mercy, and ultimately about who Christ is.

Let me ask you: When was the last time you experienced real darkness? Not the darkness of evening but complete, enveloping darkness? Most of us have encountered it—in caves, in windowless rooms, in power outages. Do you remember the feeling? There’s something about complete darkness that disorients us. Our most reliable sense—sight—fails us. We become vulnerable. We become dependent. That’s what happens to Egypt. They lose the ability to see. They lose their bearings. And this is no accident.

Section 1: The Plague’s Reality and Nature

Let’s read the account together. Exodus 10:21-29 describes what happens.

“Then the LORD said to Moses, ‘Stretch out your hand toward heaven, that there may be darkness over the land of Egypt, darkness which may even be felt.’ So Moses stretched out his hand toward heaven, and there was thick darkness in all the land of Egypt for three days. They did not see one another, nor did anyone rise from his place for three days; but all the children of Israel had light in their dwellings.”

Notice the language. Darkness that “may even be felt.” This is not metaphorical twilight. This is not the absence of sunlight in an evening. This is darkness with physical presence. Darkness substantial enough that people cannot travel. It’s so dark that Egyptians cannot see one another. It’s so dark they abandon their positions, presumably terrified.

Now, what was this darkness? Scholars have proposed several possibilities. Some suggest a severe khamsin—a desert windstorm carrying sand and ash that could block the sun almost entirely. These storms are documented in ancient Egypt. They can reduce visibility dramatically. Sand can hang in the air for days, creating an eerie twilight. That’s a plausible natural mechanism.

Others suggest volcanic ash, a kind of cosmic darkness related to some catastrophic atmospheric event. Still others argue for complete supernatural darkness, an intervention that transcends natural explanation.

Here’s what matters for our purposes: the text doesn’t primarily care which mechanism God used. The text cares that God controlled it. God said to Moses, “Stretch out your hand,” and darkness came. The text says it lasted three days. The text emphasizes that Egyptians couldn’t see each other, couldn’t leave their places. And most importantly, the text says this in verse 23: “But all the children of Israel had light in their dwellings.”

This detail is crucial. While Egypt experienced total darkness, Israel experienced light. The same phenomenon—whether natural or supernatural—did not affect Israel. They had light in their homes. They could see. They could move. They could live normally. In other words, the plague was specifically directed against Egypt, not against the land as a natural entity.

This tells us something profound about God’s character. God’s judgment is not indiscriminate. God’s plagues are not natural disasters that strike randomly. They are precision instruments. They accomplish God’s specific purposes. They differentiate between the righteous and the unrighteous. They preserve those who belong to God while judging those who oppose Him.

Think about what this means for Pharaoh and his people. For three days, they cannot function. Commerce stops. Travel stops. Life stops. They sit in their houses, paralyzed. And why? Because their ruler refuses to let God’s people go. Pharaoh’s stubbornness has consequences that extend to everyone around him. That’s important to grasp. Sin has corporate dimensions. When a leader hardens his heart against God, the people under his authority suffer.

Yet even in this judgment, God is showing mercy. The text says in verse 27, after the darkness lifts, “But the LORD hardened Pharaoh’s heart, and he would not let them go.” Hardened him. Even after this devastating plague, Pharaoh chooses to continue his rebellion. God’s sign—this incredible act of power—fails to produce repentance. Instead, Pharaoh’s heart becomes even more resistant.

This raises the question we’ll address in a few minutes: Why does God harden Pharaoh’s heart? But before we get there, we need to understand the theological significance of darkness itself. Why darkness specifically? That’s where we need to zoom out and see this plague within the larger story of Scripture.

Section 2: Darkness in Scripture’s Redemptive Arc

Let’s trace darkness from the beginning of the Bible to its end.

Open to Genesis 1. In the creation account, what’s the first thing God creates? Light. “Let there be light,” God says, and light appears. Before that, we read about “darkness” covering the deep. This isn’t evil darkness yet. It’s chaos darkness. It’s the absence of order. And God’s first creative act brings light and establishes the distinction between light and darkness: “And God called the light Day, and the darkness He called Night.”

From the very beginning, light represents order, life, blessing, and God’s creative activity. Darkness represents chaos, the unordered, the unrevealed. This foundational distinction—light is good, darkness is not—becomes the vocabulary God will use throughout Scripture.

Now jump to Exodus 10. Here, God uses darkness as judgment. This is not chaos darkness anymore. It’s purposeful darkness. Intentional darkness. God is saying to Pharaoh and to Egypt: “You have refused my light. You have rejected my word. Therefore, I will show you what it means to be separated from blessing. I will show you darkness.”

In the historical narratives and in the Psalms, darkness continues this association with judgment. Psalm 18 speaks of God who “made darkness his covering, His canopy around Him.” There, darkness is where God dwells when He comes as judge. Isaiah 45:7 declares explicitly, “I am the LORD… I form light and create darkness.” Darkness is not a demonic force opposing God. It’s God’s tool. God creates darkness to accomplish His purposes.

But here’s where it gets rich. Move to the prophets. Isaiah speaks of people sitting in darkness and seeing a great light. The light that will come is the Messiah. The darkness that covers people is the absence of salvation, the absence of God’s presence. When Isaiah 9:2 says, “The people who walked in darkness have seen a great light,” he’s using the language of Exodus. He’s evoking the darkness plague. He’s saying that Israel itself has been like Egypt—in darkness. But a light is coming. A Messiah who is light.

Then we get to the New Testament. John opens his Gospel with cosmic language. “In the beginning was the Word.” There’s an echo of Genesis. The Word is the light that brought creation into being. And in John 1:5, John writes something stunning: “The light shines in the darkness, and the darkness has not overcome it.”

Then in John 8:12, Jesus says, “I am the light of the world. Whoever follows me will never walk in darkness, but will have the light of life.” Jesus takes the language of creation, the language of Exodus judgment, the language of prophetic hope, and He applies it to Himself. He is the fulfillment of light. He is the one who brings people out of darkness.

Paul uses the same language. In Romans 13:12, he writes, “The night is nearly over; the day is almost here. So let us put aside the deeds of darkness and put on the armor of light.” In Ephesians 5:8, “For you were once darkness, but now you are light in the Lord.” The darkness/light distinction that began in Genesis and was reinforced in Exodus becomes Paul’s way of describing the Christian condition.

And finally, move to the end of Scripture. In Revelation 21:23-25, John describes the new creation: “The city does not need the sun or the moon to shine on it, for the glory of God gives it light, and the Lamb is its lamp… There will be no more night.”

Do you see the trajectory? It begins with light in creation. It continues with light separated from darkness in Exodus. It develops through the prophets as light coming through a Messiah. It culminates in the New Testament with Jesus as the Light. And it ends in eternity with perpetual light in the presence of God and total darkness for those who reject light.

Exodus 10 is not an isolated historical incident. It’s a pivot point in a cosmic narrative. The darkness plague shows us that God takes seriously the distinction between light and darkness, between order and chaos, between His presence and His absence. And it sets up everything that comes after.

Section 3: The Hardening Question

Now we must address something that troubles many people when they read Exodus. The text says God hardened Pharaoh’s heart. But it also says Pharaoh hardened his own heart. How can both be true? Is Pharaoh responsible if God is hardening him? And what does this have to do with Exodus 10 specifically?

Let’s look at the progression. Read Exodus 8:15: “But when Pharaoh saw that there was relief, he hardened his heart and would not listen to them, as the LORD had said.” Here, Pharaoh hardens himself. It’s his choice.

Now read Exodus 9:12: “But the LORD hardened Pharaoh’s heart, and he would not listen to them.” Here, God hardens Pharaoh.

In Exodus 10:1, God tells Moses, “I will bring one more plague on Pharaoh and on Egypt… that you may know that I am the LORD.” Then at 10:20: “But the LORD hardened Pharaoh’s heart, and he would not let the children of Israel go.”

So we have Pharaoh hardening himself, and we have God hardening Pharaoh. Both are true. Both happen. How do we make sense of this?

Here’s the key insight: look at the pattern. Early in the plague sequence, the text emphasizes Pharaoh’s own hardening. He sees relief from the plague and he hardens himself. Implicit in that is moral choice. Pharaoh experiences God’s power and chooses to resist. But as the plagues continue and Pharaoh continues to resist, the language shifts. God hardens Pharaoh.

What’s happening is this: Pharaoh makes genuine choices to resist God. But as he repeatedly chooses resistance, his capacity to receive God’s word diminishes. Sin hardens. Resistance to light produces blindness. Refusal to repent produces a refusal-resistant heart. At a certain point, having chosen repeatedly to close his eyes to God’s signs, Pharaoh’s hardness becomes complete. God doesn’t create that hardness from nothing. God uses the hardness that Pharaoh has created through his own choices.

Think of it this way: imagine a person who rejects light. Day after day, they close their eyes to truth. Day after day, they refuse to look. At some point, if the refusal is persistent enough, the person loses the capacity to see. Not because someone blinded them violently but because they closed their eyes so many times that they’re stuck shut. That’s the dynamics of hardening.

This is crucial for understanding both Exodus and the Christian life. God doesn’t override human freedom. Pharaoh is not a puppet. But God doesn’t ignore human choice either. God responds to the patterns we establish. If we repeatedly choose darkness, we become dark. If we repeatedly choose resistance, we become resistant. God hardens the heart that hardens itself.

For Pharaoh, this progression leads to judgment. The darkness plague comes at the end of the series, and despite it, despite seeing this incredible sign of God’s power, Pharaoh still refuses. His heart is so hardened that even darkness cannot move him.

But here’s the grace note in the story: God continues to give signs. God continues to call. Right up to the final plague, Pharaoh has opportunity to repent. The hardening is not irrevocable until the very end. God is patient. God gives sign after sign. God speaks through Moses repeatedly. God gives Pharaoh genuine opportunity to respond. But Pharaoh chooses not to take it.

For us, this means something sobering and something hopeful. Sobering: our choices matter. Our repeated refusals matter. Our resistance to God’s word produces hardness in us. We become what we repeatedly choose to be. Hopeful: God doesn’t harden us instantly. God gives us time. God gives us signs. God gives us opportunity to turn back. The question is whether we’ll respond to those opportunities before our hearts become too hard to bend.

Section 4: Connection to Christ and Application

Let me bring it home. Everything in Exodus 10 points forward to Christ. How?

First, Christ is the light. In John 8:12, Jesus declares, “I am the light of the world. Whoever follows me will never walk in darkness, but will have the light of life.” This is Christ speaking of Himself using the language established in creation and developed through Exodus. He is claiming to be the one in whom light dwells, the one who brings order out of chaos, the one who rescues people from darkness.

Second, just as Exodus 10:23 describes Israel having light in their dwellings while Egypt sits in darkness, so Christ divides humanity. Those who believe in Him have light. Those who reject Him dwell in darkness. John 3:19-20 describes it: “This is the judgment: Light has come into the world, but people loved darkness instead of light because their deeds were evil… But whoever lives by the truth comes into the light, so that it may be seen plainly that what he has done has been done in the sight of God.”

Third, and most importantly, Christ’s work parallels the Exodus pattern. In Egypt, judgment falls on those who oppose God. The firstborn are struck. Pharaoh’s rebellion brings death to his own people. Yet in the Exodus narrative, there’s provision for escape. The blood of the lamb marks the dwelling of those who trust God, and the firstborn are protected.

This is the pattern Christ fulfills. God’s judgment against sin is real. The wages of sin is death. But Christ, like the Passover lamb, provides a way of escape. His blood, shed on the cross, marks those who trust Him. His death becomes our protection. The judgment that should fall on us falls on Him instead. We get light. We get life. We get the protection we don’t deserve.

The darkness plague foreshadows this. What Egypt experiences in darkness is a shadow of what judgment looks like when separated from God’s mercy. What Israel experiences in light is a shadow of what salvation looks like when we trust God’s provision.

So Exodus 10 is not just an ancient story about an ancient conflict. It’s an announcement, in historical form, of what Christ will do. It’s God saying, through plague and sign, “I will divide darkness from light. I will judge sin. I will protect My people. I will bring them out. And the one who will accomplish this, ultimately, is the Light of the World.”

Now, where are you in this story? Let me be direct. You’re either in Egypt or you’re in Israel. You’re either sitting in darkness or you’re walking in light. Those are the only two options Scripture gives us. Jesus didn’t come to give us a third option. He came as Light. He divides people into those who believe and those who don’t, those who follow and those who don’t, those who have light and those who don’t.

If you’re sitting in darkness, Exodus 10 is a warning and an invitation. It’s a warning that darkness is serious. God will judge. But it’s also an invitation, because the light has come. Christ offers Himself. He offers not just forgiveness but new identity, new vision, new life in the light.

If you’re walking in light—if you’ve trusted Christ—then you are to be light-bearers. Not because you earned it but because you’ve been saved by it. Just as Israel had light in Egypt while Egypt had darkness, you are called to reflect Christ’s light into a darkening world. You’re called to help people see.

This is our task. This is our calling. We study Exodus not as ancient history but as proclamation about who Christ is and what He accomplished. The God who ruled over darkness in Egypt is the God who sent His Son into darkness at Calvary to bring light to the world.