Genesis 1:20 records God giving the command that brings living creatures into the waters and birds into the open sky on the fifth day of creation. In plain terms, it describes God speaking life into being and filling the seas and air with creatures that are good in his sight. God himself is the speaker, and the words are addressed to the created order, calling the waters and the sky to produce what he has planned for them.
God said, “Let the waters abound with living creatures, and let birds fly above the earth in the open expanse of the sky.”
Genesis 1:20 (WEB)
What Genesis 1:20 Means
The verse opens with “God said,” which tells you how creation happens in this chapter. God does not struggle or work with materials that resist him. He speaks, and the world responds. Each day of Genesis 1 follows this pattern, and here the speech is simply a command to fill the waters and skies.
“Let the waters abound with living creatures” describes the sea as a place that will teem with life. The word “abound” suggests fullness and movement rather than a thin scattering. Then “let birds fly above the earth in the open expanse of the sky” assigns the air to flying creatures, so that every major region of the world has its own inhabitants. The verse is a description of purpose and provision: the waters and the sky are made to carry life.
What the verse does not do is explain how creatures came to exist in precise biological detail, or settle every question about the age of the earth or the mechanics of the process. It shows God as the source and ruler of life, and it gives the reader confidence that the living world has a Creator who intended it. It is a statement about who made the world and why it is full, not a lab manual.
The Context of Genesis 1:20
Genesis is the first book of the Torah, traditionally attributed to Moses, and it was written to a people who had just come out of Egypt and were preparing to enter the promised land. Its opening chapters tell them who God is and where they come from. In that setting, a sentence about God filling the seas and skies with life would have reminded them that the world around them belongs to the God who called them into covenant.
The verses just before and after show the rhythm of the chapter. Verses 17 and 18 describe God setting the lights in the sky and declaring the work good, and verses 21 through 23 show God creating the sea creatures and birds, blessing them, and calling them to be fruitful. Verse 20 sits in the middle of this pattern, so it reads as one step in an ordered, deliberate act of creation. Each day builds on the last, and the blessing that follows verse 20 shows that God’s purpose for these creatures is life and growth.
Key Phrases in Genesis 1:20
Genesis 1:21
God created the large sea creatures and every living creature that moves, with which the waters swarmed, after their kind, and every winged bird after its kind. God saw that it was good.
(WEB)
This verse continues the story of the fifth day, describing God creating the great sea creatures and every winged bird after its kind. It fills in the details that verse 20 introduces and shows God’s careful attention to each creature.
Psalm 104:25
There is the sea, great and wide, in which are innumerable living things, both small and large animals.
(WEB)
The psalmist looks at the same sea and marvels at its teeming life, both great and small. Psalm 104 is a song of praise for God’s care over creation, and it shows how the sea described in Genesis 1:20 remains a place of wonder and dependence on God.
A Short Prayer From Genesis 1:20
Lord, you spoke, and the waters filled with life and the skies opened for birds. Thank you for a world that is full of purpose and beauty, from the deep seas to the open air. When my own days feel empty or uncertain, remind me that you are the God who calls life into being. Help me to trust your word and to notice the living things around me as gifts from your hand. Let my heart respond to your goodness with thanks and hope. Amen.
