Exodus 7:19
And the LORD said to Moses, "Tell Aaron, 'Take your staff and stretch out your hand over the waters of Egypt--over their rivers and canals and ponds and reservoirs--that they may become blood.' There will be blood throughout the land of Egypt, even in the vessels of wood and stone."
And the LORD said to Moses,

The command proceeded from the covenant God of Israel, who continued to reveal His will through Moses. Moses stood before Pharaoh not by personal authority but as the appointed servant through whom the Lord confronted Egypt and prepared His people for deliverance.

Exo 3:4 When the LORD saw that he had gone over to look,…
Num 12:6 He said, “Hear now My words: If there is a prophet among you…
Deu 34:10 Since that time, no prophet has risen in Israel…

“Tell Aaron,

Aaron acted under Moses’ direction as the visible agent of God’s command. The arrangement established during Moses’ calling allowed Aaron to speak and act alongside his brother, displaying God’s provision for the work He assigns.

Exo 4:14-16 When he sees you, he will be glad in his heart.…
Exo 4:27-28 Meanwhile, the LORD had said to Aaron, “Go and meet Moses…
Exo 6:13 Then the LORD spoke to Moses and Aaron, giving them a charge…

‘Take your staff and stretch out your hand over the waters of Egypt—

Aaron’s staff, already identified with God’s power before Pharaoh, became the instrument through which the Lord publicly demonstrated His rule over Egypt. The outstretched hand signified a divinely commanded act, not magic or human manipulation.

Exo 8:5-6 And the LORD said to Moses, “Tell Aaron, ‘Stretch out…
Exo 14:16 And as for you, lift up your staff and stretch out your hand…
Num 20:8 Take the staff and assemble the congregation.…

over their rivers and canals and ponds and all the reservoirs—

Egypt depended upon the Nile and its network of streams, irrigation channels, pools, and stored water for drinking, farming, travel, and commerce. By reaching every source of water, the judgment exposed Egypt’s utter dependence upon the God whom Pharaoh had refused to acknowledge. The plague also struck at the honor given to the Nile and the false gods associated with its life-giving floods.

Isa 11:15 The LORD will devote to destruction the gulf…
Isa 19:5-7 The waters of the Nile will dry up, and the riverbed…
Ezk 30:12 I will make the streams dry up and sell the land…

that they may become blood.’

God literally turned Egypt’s waters into blood, making the source of life a sign of death and judgment. The plague revealed that the Lord governs creation and can turn its ordinary blessings into instruments of warning against rebellion. Jesus’ turning water into wine at Cana later displayed His authority over creation in a work of blessing, pointing to the saving significance of His blood in the new covenant.

Exo 4:9 take some water from the Nile and pour it…
Rev 11:6 These witnesses have power to shut the sky…
Rev 16:4 And the third angel poured out his bowl into the rivers…

There will be blood throughout the land of Egypt,

The judgment extended beyond Pharaoh’s court and reached the entire land. Egyptians and Israelites alike witnessed the Lord’s power, while Egypt’s gods proved unable to protect the nation or restore its waters.

Psa 78:44 He turned their rivers to blood, and from their streams…
Psa 105:29 He turned their waters to blood and caused…
Rev 16:3 And the second angel poured out his bowl into the sea…

even in the vessels of wood and stone.”

Water already drawn and stored in household containers also became blood, leaving no refuge from the plague. God’s judgment reached both public waterways and private homes, showing that no human preparation, possession, or idol could shield Egypt from His hand.

Jhn 2:6-9 Now six stone water jars had been set there…
2Ki 4:3-6 “Go,” said Elisha, “borrow empty jars from all your neighbors.…
2Ti 2:20-21 A large house contains not only vessels of gold and silver……

Persons / Places / Events
1. The LORD (Yahweh)
The covenant-keeping God of Israel, who is demonstrating His power over the gods of Egypt.

2. Moses
The prophet and leader of the Israelites, chosen by God to lead His people out of Egypt.

3. Aaron
Moses' brother and spokesperson, who acts on Moses' behalf by performing the miracles.

4. Egypt
The land where the Israelites are enslaved, ruled by Pharaoh, and the setting for the plagues.

5. The Plague of Blood
The first of the ten plagues, where the waters of Egypt are turned to blood as a sign of God's power and judgment.
Teaching Points
God's Sovereignty Over Creation
God demonstrates His absolute control over nature, reminding us that He is the Creator and Sustainer of all things.

Judgment and Mercy
The plagues serve as both a judgment against Egypt and a means of deliverance for Israel, illustrating God's justice and mercy.

Obedience to God's Commands
Moses and Aaron's obedience in performing God's commands is a model for us to follow God's instructions, even when they seem daunting.

The Power of God’s Word
The transformation of water to blood shows the power of God's word, encouraging us to trust in His promises and commands.

The Hardness of Heart
Pharaoh's resistance to God's signs warns us of the dangers of hardening our hearts against God's will.
Bible Study Questions
1. How does the transformation of water to blood in Exodus 7:19 demonstrate God's sovereignty over creation?

2. In what ways does the first plague serve as both a judgment and a means of deliverance? How can this dual purpose be seen in other parts of Scripture?

3. What can we learn from Moses and Aaron's obedience in this passage about following God's commands in our own lives?

4. How does the account of the first plague in Egypt connect to the future judgments described in Revelation? What does this tell us about God's consistent character?

5. Reflect on a time when you experienced a "hardening of heart" in your own life. How can you apply the lessons from Pharaoh's response to God's signs to avoid similar pitfalls?
Connections to Other Scriptures
Genesis 1:1-2
The creation of water as part of God's original creation, showing His sovereignty over all elements.

Revelation 16:3-4
The future judgment where waters turn to blood, echoing the plagues of Egypt as a sign of God's ultimate authority and justice.

Psalm 78:44
A recounting of the plagues, emphasizing God's mighty acts in delivering His people.

John 2:1-11
Jesus turning water into wine, contrasting the judgment of Egypt with the blessing and new covenant in Christ.
The Great ConflictH.T. Robjohns Exodus 7:1-25
The Lord, He is GodG.A. Goodhart Exodus 7:1-25
Opportunity in Christian ServiceJ. S. Exell, M. A.Exodus 7:14-25
Superstitions Respecting the NileT. S. Millington.Exodus 7:14-25
The First Plague: the Water Turned to BloodD. Young Exodus 7:14-25
The Nile Turned into BloodJ. Orr Exodus 7:14-25
The River Changed into BloodJ. S. Exell, M. A.Exodus 7:14-25
The River Turned into BloodJ. S. Exell, M. A.Exodus 7:14-25
The River Which was Turned into BloodA. McAuslane, D. D.Exodus 7:14-25
The Water Turned into BloodJ. Urquhart Exodus 7:14-25
People
Aaron, Egyptians, Israelites, Moses, Pharaoh
Places
Egypt, Nile River
Topics
Aaron, Blood, Buckets, Canals, Collections, Egypt, Egyptians, Everywhere, Jars, Ponds, Pools, Reservoirs, Rivers, Rod, Spake, Spoke, Staff, Stone, Streams, Stretch, Stretched, Throughout, Turn, Vessels, Waters, Wood, Wooden
Dictionary of Bible Themes
Exodus 7:19

     4366   stones
     4552   wood

Exodus 7:8-24

     5593   trial

Exodus 7:14-20

     4512   staff

Exodus 7:14-21

     7318   blood, symbol of guilt

Exodus 7:17-21

     4260   rivers and streams

Exodus 7:19-20

     5072   Aaron, spokesman

Library
The History of the Prophetic Sermons, Epistles, and Apocalypses
[Sidenote: Real character and aims of the prophets] To understand and rightly interpret the prophetic writings of the Old Testament it is necessary to cast aside a false impression as to the character of the prophets which is widely prevalent. They were not foretellers, but forth-tellers. Instead of being vague dreamers, in imagination living far in the distant future, they were most emphatically men of their own times, enlightened and devoted patriots, social and ethical reformers, and spiritual
Charles Foster Kent—The Origin & Permanent Value of the Old Testament

Letter Lxxxv. To Paulinus.
Paulinus had asked Jerome two questions, (1) how can certain passages of scripture (Exod. vii. 13; Rom. ix. 16) be reconciled with Free Will? and (2) Why are the children of believers said to be holy (1 Cor. vii. 14) apart from baptismal grace? For the first of these questions Jerome refers Paulinus to his version (newly made) of Origen's treatise, On First Principles. For the second he quotes the explanation of Tertullian. Written in 400 a.d. 1. Your words urge me to write to you but your eloquence
St. Jerome—The Principal Works of St. Jerome

The Hardening in the Sacred Scripture.
"He hath hardened their heart."-- John xii. 40. The Scripture teaches positively that the hardening and "darkening of their foolish heart" is a divine, intentional act. This is plainly evident from God's charge to Moses concerning the king of Egypt: "Thou shalt speak all that I command thee; and I will harden Pharaoh's heart, and multiply My signs and wonders in the land of Egypt. But Pharaoh shall not harken unto you, and I will lay My hand upon Egypt, and the Egyptians shall know that I am the
Abraham Kuyper—The Work of the Holy Spirit

Sixteenth Sunday after Trinity Paul's Care and Prayer for the Church.
Text: Ephesians 3, 13-21. 13. Wherefore I ask that ye may not faint at my tribulations for you, which are your glory. 14 For this cause I bow my knees unto the Father, 15 from whom every family in heaven and on earth is named, 16 and that he would grant you, according to the riches of his glory, that ye may be strengthened with power through his Spirit in the inward man; 17 that Christ may dwell in your hearts through faith; to the end that ye, being rooted and grounded in love, 18 may be strong
Martin Luther—Epistle Sermons, Vol. III

Exposition of Chap. Iii. (ii. 28-32. )
Ver. 1. "And it shall come to pass, afterwards, I will pour out My Spirit upon all flesh; and your sons and your daughters shall prophesy; your old men shall dream dreams, and your young men shall see visions." The communication of the Spirit of God was the constant prerogative of the Covenant-people. Indeed, the very idea of such a people necessarily requires it. For the Spirit of God is the only inward bond betwixt Him and that which is created; a Covenant-people, therefore, without such an inward
Ernst Wilhelm Hengstenberg—Christology of the Old Testament

Exodus
The book of Exodus--so named in the Greek version from the march of Israel out of Egypt--opens upon a scene of oppression very different from the prosperity and triumph in which Genesis had closed. Israel is being cruelly crushed by the new dynasty which has arisen in Egypt (i.) and the story of the book is the story of her redemption. Ultimately it is Israel's God that is her redeemer, but He operates largely by human means; and the first step is the preparation of a deliverer, Moses, whose parentage,
John Edgar McFadyen—Introduction to the Old Testament

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