Genesis Deeper ⑤ The Day the Sea and Sky Came Alive — why does the Bible single out the “great sea creatures”? (Genesis 1:20–23)
A series that takes one Bible passage at a time and looks a little deeper. Every post comes with images you are free to use in worship, class, or on social media.
God said, “Let the waters abound with living creatures, and let birds fly above the earth in the open expanse of the sky.” 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. God blessed them, saying, “Be fruitful, and multiply, and fill the waters in the seas, and let birds multiply on the earth.” There was evening and there was morning, a fifth day.
— Genesis 1:20–23, World English Bible
1. Into the places that were made, something alive moves in
The first three days of Genesis 1 are days for making places. Light is separated from darkness, an expanse divides the waters and becomes sky, the waters gather and dry land appears.
From the fourth day on, those places get filled. The sky that was spread out on day two receives its lights on day four.
Day five takes the same step once more. Into the waters and the sky that were divided on day two come the things that live inside them.
Run through what has been made so far and you can see why day five is different. Light, the expanse, sea, dry land, grass and trees, sun and moon and stars. Generous and beautiful — but not one of them moves itself. Grass stands where it sprouted; the lights travel a fixed path.
On day five, for the first time, life that moves on its own enters the world.
2. Written in three groups, and then blessed
In verse 20 God speaks in two directions. Downward, “Let the waters abound with living creatures”; upward, “let birds fly above the earth in the open expanse of the sky.”
Verse 21 records what came of that, and the way it records it is worth noticing. Scripture sorts it into three groups: the large sea creatures, every living creature that moves, with which the waters swarmed, and every winged bird.
The last two carry the same phrase: “after their kind.” Not a tangled heap but a world with grain in it. Scripture does not count the creatures; it records that they come sorted.
Then in verse 22 God blesses them. Read Genesis from the first verse and this is the first time a blessing is recorded. Light was not blessed. Neither was the sky, the sea, the dry land, the sun or the moon.
The first blessing in the Bible went to fish and birds.
3. Going deeper — why does the Bible single out the “great sea creatures”?
Look at verse 21 again and something catches. Up to this point Genesis 1 has never named one creature apart from the rest. Grass and trees were grouped by kind; even the sun and moon were only “the greater light” and “the lesser light”.
Yet here one group is set at the front, on its own. The large sea creatures.
In Hebrew that is hattanninim haggedolim(הַתַּנִּינִם הַגְּדֹלִים), from the singular tannin(תַּנִּין). Elsewhere in Scripture the word is used for the enormous things of the sea.
So why does this one group get named?
Many scholars read the neighbouring cultures of the ancient Near East as telling stories in which a vast creature of the sea is something the gods must fight and defeat. The sea was a fearful place, and the great thing living in it more fearful still.
Genesis 1 does not tell that story. There is no battle and no victory. Instead there is a list, and the creature goes into it — one line among the things God made, between the fish and the birds.
And the sentence that closes every other entry closes this one too. “God saw that it was good.”
Scripture never tells us what animal a tannin was. No size, no description. Where the Bible stops, it is better that we stop too.
What the text does say is plain enough. The thing people feared most was one of the made things. Not an opponent to be beaten — something formed and set in its place.
Much later a psalm calls out to that same tannin: “Praise Yahweh from the earth, you great sea creatures, and all depths” (Psalm 148:7). The word rendered ‘great sea creatures’ there is the word of Genesis 1:21. What was once the object of dread is standing in the choir.
4. Three words — swarm, create, bless
“Let the waters abound with living creatures” in verse 20 is yishretzu … sheretz(יִשְׁרְצוּ … שֶׁרֶץ) — a verb and a noun from the same root, set side by side. Rendered roughly, it is “let the waters swarm with swarms”. Not a picture of one creature appearing, or two, but of water filling past counting.
What follows is nephesh chayyah(נֶפֶשׁ חַיָּה), “living soul”. What fills the water, Scripture says, is not matter but life.
“Created” in verse 21 is wayyivra(וַיִּבְרָא); the dictionary form is bara(בָּרָא). In Genesis 1 that verb appears in only three places — verse 1 for the heavens and earth, verse 21 for the sea creatures and birds, and verse 27 for humankind. In all three the subject is God. Day five is one of those three hinges.
“Blessed” in verse 22 is wayvarekh(וַיְבָרֶךְ), from barak(בָּרַךְ). This is the first place in Scripture where God is said to bless.
The content of the blessing is worth sitting with. “Be fruitful, and multiply, and fill the waters in the seas.” In Hebrew the imperatives come one after another. The blessing was not an invitation to sit still; it was a charge to fill the place.
5. A fifth day
Day five closes with the same sentence as the rest. “There was evening and there was morning, a fifth day.”
A great sea creature has just appeared, and the ending does not change. The voice does not rise; the explanation does not lengthen. The way God counts a day does not shift for whatever was made in it.
6. For us today
What stays with you from day five is a single line in a list. The thing people feared most is written down between the fish and the birds. Neither shrunk nor inflated — set there as one of the made things.
We have those too. The thing whose name alone makes the chest heavy; the diagnosis we try not to think about; the relationship that will not come untangled.
Genesis 1 does not say those things have gone away. The great sea creature is still large. What it tells us is where it stands. Inside the world God made.
And the first blessing was “fill”. The sea did not fill in a morning. It multiplied, a little at a time, and in the end it was full. That there is not much to see yet does not mean it is not a blessing. A thing still increasing is a blessing too.
“God who filled the sea and the sky with life, we confess that even the largest and most fearful things were made by You. Let me remember that what frightens me is not outside Your hand. When growth looks slow, let me trust the blessing that said ‘fill’, and keep the place You have given me today. Amen.”
🕊 Using this in ministry
Opening question
“What is the scariest thing in the sea?” When sharks, whales or octopuses come up, follow it with “and did God make that one too?”
Activity
Put the empty sea image on screen first and ask “what is missing here?” As they name fish and birds, have them tape paper fish and paper birds to the wall one at a time, then switch to the full image. Make the point: “God blessed them and said ‘fill it’.”
Application
Put the great sea creature image on screen and have each person name one thing they are afraid of. Then read Genesis 1:21 together and close with “God made this one too, and He called it good.” Do not insist that it is not frightening — just settle who made it.
🖼️ Today’s four images · press and hold or right-click to save
The sea and sky before life |
Let the waters abound with living creatures |
The large sea creatures |
Be fruitful, and multiply, and fill |
📄 Image licence CC0 (Public Domain) · Use, modify and redistribute freely, no attribution required.
🤖 These images were created with AI (Grok).
🎨 Week 1 Creation — 28 free images — transparent PNG · CC0, day one through day seven
🇰🇷 한국어 · 🇺🇸 English (current) · 🇰🇭 ភាសាខ្មែរ
Origin Bible · Mission Zedero
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✍️ This article was written with the help of AI and reviewed by a person.
Article text is CC BY-NC 4.0 — free for non-commercial use with attribution.
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