Genesis 1:20 describes the fifth day of creation, when God commands the seas and the skies to teem with living things. In plain terms, the verse says that God brought animal life into being by speaking, and that he filled the water with fish and sea creatures and the air with birds. God is the one speaking, and the words are addressed to the waters and the open sky, which he has just shaped on the earlier days. The verse belongs to the opening account of creation in the book of Genesis, traditionally attributed to Moses.
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 begins with “God said,” which sets the pattern for the whole creation account. God does not work with tools or effort here. He speaks, and what he says takes shape. That is the first thing the verse teaches: creation depends on the word of a God who is free, powerful, and not struggling against anything.
The phrase “let the waters abound with living creatures” means that the seas are meant to be crowded with life. The word “abound” suggests an overflowing abundance, not a thin scattering. Then the verse turns to the sky: “let birds fly above the earth in the open expanse of the sky.” The birds are given the space above the land, the wide open air that God had set apart on the second day.
What the verse does not do is explain how the creatures came to be in detail, or settle every question about the timing and methods of creation. It is a theological account, written to show who made the world and how he made it, and to present the world as ordered, purposeful, and under God’s authority.
The Context of Genesis 1:20
Genesis is the first book of the Hebrew Bible and the Christian Old Testament. Tradition credits Moses with writing the Pentateuch, the first five books, though many scholars date the final form of the text later and see it shaped over time. The original audience was the people of Israel, a community that needed to understand who their God was in contrast to the many gods of the surrounding nations. Those nations often told stories where the sea and its monsters were rival powers. Genesis tells a different story: the sea is not a god, but a created thing that obeys the Lord.
The verses just before and after set the scene. In Genesis 1:17 to 19, God places the lights in the sky, and the fourth day closes. Then in Genesis 1:21 to 23, God creates the great sea creatures and the birds “after their kind,” blesses them, and calls them to be fruitful and multiply. The fifth day therefore moves from speaking into the making of living things, and ends with a blessing. Reading the verse within that sequence shows that the abundance of life is not an accident but part of a deliberate, good design that God himself blesses.
Key Phrases in Genesis 1:20
Psalm 104:24-25
24 The LORD, how many are your works! In wisdom have you made them all. The earth is full of your riches. 25 There is the sea, great and wide, in which are innumerable living things, both small and large animals.
(WEB)
This psalm celebrates God’s wisdom in creating the earth and the sea, with its countless living things. It echoes Genesis 1:20 by praising the Lord for filling the waters with creatures, and it adds a tone of wonder and gratitude that the creation account implies.
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 fifth day and names the great sea creatures and the winged birds “after their kind.” Reading it alongside Genesis 1:20 helps you see that the abundance of life was ordered, with each creature given its own nature and place within God’s good design.
