Exodus 7:20 describes the first of the ten plagues on Egypt: Moses and Aaron strike the Nile with a staff, and its water turns to blood. The verse shows God acting in direct judgment against Pharaoh and the gods of Egypt, and it is meant to make clear who the true Lord is. God tells Moses to speak this word and carry out this sign before Pharaoh, Egypt’s king, and his officials.
Moses and Aaron did so, as the LORD commanded; and he lifted up the rod, and struck the waters that were in the river, in the sight of Pharaoh, and in the sight of his servants; and all the waters that were in the river were turned to blood.
Exodus 7:20 (WEB)
What Exodus 7:20 Means
The verse begins by saying that Moses and Aaron obeyed exactly as the LORD had commanded. That detail matters. The prophets do not invent their own plan. They act on the word they were given, and the result follows from God’s instruction rather than from their own ability. Moses lifts the rod and strikes the water of the river, the Nile, which Egyptians depended on for drinking, farming, and daily life.
The phrase “in the sight of Pharaoh, and in the sight of his servants” tells you that this was a public act. The plague was not hidden or ambiguous. Pharaoh and his court saw it happen. The verse ends plainly: all the water in the river turned to blood. The text describes what happened, not how the change worked in detail, so the verse is best read as a clear account of God’s power over the very source of Egypt’s life and security.
What the verse does not do is explain every physical question about the event, nor does it promise anything to the reader in a personal sense. It is a historical and theological account of judgment and revelation. Its lasting message concerns God’s authority and his purpose to make himself known, which the next verse in the passage states directly.
The Context of Exodus 7:20
Exodus is traditionally attributed to Moses, and it tells the story of Israel’s deliverance from slavery in Egypt and the beginning of their covenant relationship with God at Sinai. The first plague opens a sequence of ten judgments that finally leads to the Israelites’ release. Just before this verse, God has told Moses that Pharaoh will not listen and that signs and wonders will follow, so that the Egyptians will know that he is the LORD.
Read in that setting, the verse is not a random display of force. It is the first answer to Pharaoh’s refusal to let Israel go. Verse 17 states the purpose outright: “In this you shall know that I am the LORD.” The turning of the water is therefore a proof, aimed at Pharaoh and at Egypt, of a truth about God that Egypt has not acknowledged. Verses 22 and 23 then show that Pharaoh’s heart remains hard, which prepares the reader for the plagues that follow.
Key Phrases in Exodus 7:20
Exodus 7:17
The LORD says, “In this you shall know that I am the LORD. Behold, I will strike with the rod that is in my hand on the waters which are in the river, and they shall be turned to blood.
(WEB)
This verse states the purpose of the plague directly: “In this you shall know that I am the LORD.” Reading it alongside Exodus 7:20 makes clear that the turning of the water is a sign meant to reveal God’s identity and authority, not merely a punishment.
Exodus 14:4
I will harden Pharaoh’s heart, and he will follow after them; and I will get honor over Pharaoh, and over all his armies; and the Egyptians shall know that I am the LORD.” They did so.
(WEB)
Much later in the story, God says that he will harden Pharaoh’s heart so that he will pursue Israel and be glorified through it. The verse shows the same theme of God making himself known through his dealings with Pharaoh, carrying the purpose first announced in the early plagues to its climax at the sea.
A Short Prayer From Exodus 7:20
Lord, you are the one who speaks, and your word has power over every river and every kingdom. Help me to listen for your command the way Moses and Aaron did, and to act on it faithfully even when I do not understand the whole path. Where I have trusted in things that cannot give life, show me clearly and turn my heart back to you. Let my life make it plain that you are the LORD, and let me rest in your purposes, which you are faithful to carry through. Amen.
