Genesis 1:20 is God’s command on the fifth day of creation that the seas and skies be filled with living things. The verse tells us that the world was not left empty or lifeless: God spoke, and the waters and the air became crowded with creatures, each one made to live where it belongs. It is God who speaks here, addressing the created order itself, calling forth fish and birds before He creates animals on land.
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 is the rhythm of the whole first chapter. Creation happens through God’s word, not through struggle or accident. When He says “let the waters abound with living creatures,” He is commanding the seas to teem with life, a picture of abundance rather than emptiness. The word “abound” suggests more than a few scattered creatures; it suggests a busy, full, almost crowded sea.
The second half speaks of birds flying “above the earth in the open expanse of the sky.” The sky is described as an open space, the expanse God set up on the second day, and the birds are given their place within it. Each part of creation has its appointed home. The verse does not promise anything to the reader directly, but it reveals a God who gives every creature a place and a purpose in the world He made.
What the verse does not do is explain how the creatures came to be, or describe the mechanics of creation in scientific terms. Its concern is theological and poetic: God is the source of life, and His word is sufficient to fill the world with what He intends.
The Context of Genesis 1:20
Genesis is the first book of the Torah, the opening section of the Hebrew Scriptures that Christians also receive as the Old Testament. Tradition attributes the book to Moses, though many scholars date its final form later, drawing on older traditions. Its first audience was the people of Israel, who needed to understand who the God of their ancestors was and how the world came to be.
Verses 17 through 23 form a unit describing the fourth and fifth days. Just before verse 20, God sets the lights in the sky to rule over day and night and to divide light from darkness, and verse 19 marks the close of the fourth day. Verse 20 begins the fifth day, and verse 21 continues the creation of sea creatures and birds. Verse 22 adds God’s blessing, “Be fruitful, and multiply,” which connects the fifth day to the continuing life of these creatures. Reading the verse in this setting shows that the creation of life in the waters and the sky is part of a careful, ordered sequence, each day preparing the world for what comes next.
Key Phrases in Genesis 1:20
Psalm 104:25
There is the sea, great and wide, in which are innumerable living things, both small and large animals.
(WEB)
This psalm praises God for the vast, teeming sea and all the creatures within it. It expands the wonder of Genesis 1:20 into worship, showing the sea as a place where God’s creatures move in His presence and under His provision.
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)
The verse that follows Genesis 1:20 describes God creating the great sea creatures and every winged bird after its kind. Reading the two together shows how God’s command becomes actual creation, and how each creature is made according to its own kind.
A Short Prayer From Genesis 1:20
Lord, You spoke, and the waters filled with life and the sky opened for the birds. Thank You that nothing You made is without purpose or place. When I feel empty or unsure where I belong, remind me that You have already prepared room for me in Your world. Teach me to trust Your word more than my fears, and to believe that You are still bringing life where I see only silence. Fill my days with the kind of quiet growth only You can give. Amen.
