What does Genesis 1:21 mean?
ESV: So God created the great sea creatures and every living creature that moves, with which the waters swarm, according to their kinds, and every winged bird according to its kind. And God saw that it was good.
NIV: So God created the great creatures of the sea and every living thing with which the water teems and that moves about in it, according to their kinds, and every winged bird according to its kind. And God saw that it was good.
NASB: And God created the great sea creatures and every living creature that moves, with which the waters swarmed, according to their kind, and every winged bird according to its kind; and God saw that it was good.
CSB: So God created the large sea-creatures and every living creature that moves and swarms in the water, according to their kinds. He also created every winged creature according to its kind. And God saw that it was good.
NLT: So God created great sea creatures and every living thing that scurries and swarms in the water, and every sort of bird — each producing offspring of the same kind. And God saw that it was good.
KJV: And God created great whales, and every living creature that moveth, which the waters brought forth abundantly, after their kind, and every winged fowl after his kind: and God saw that it was good.
NKJV: So God created great sea creatures and every living thing that moves, with which the waters abounded, according to their kind, and every winged bird according to its kind. And God saw that it was good.
Verse Commentary:
In the prior verse, God spoke the command for the empty seas to fill up with living creatures, and for the empty skies to be filled with flying birds. Now in this verse, He executes that command. This is the blueprint for all six of the creative days of Genesis. God speaks and His words become reality. Later verses will continue the pattern of God observing His creation and calling it "good."

The verse specifically mentions the great sea creatures or sea "monsters." As with the sun and moon, these ancient beasts of the sea were frequently worshiped as gods by ancient cultures. The Bible's claim is that those creatures were merely created things, along with all the other fish and the birds. They were made by the one, true God in a day. He alone is worthy of worship.

This verse also specifies that all of these brand new creatures were made "according to their kind." From the very beginning, God divided created life into categories: kinds of plants, kinds of fish, kinds of birds. Built into each creature was the ability, the necessity, to reproduce their own kind.

Again, God recognizes that what He has made is good, giving His approval to the world He is building.
Verse Context:
Genesis 1:14–25 describes the second three days of creation: days four, five, and six, just prior to the creation of human kind. As with the first three, there is a common pattern. God's spoken word results in creation, which God then names and declares ''good.'' The day is then numbered. Each of these days fills something created in one of the prior three days. The sun and moon are created on day four, while day and night were created on day one. Sea creatures are created on day five, for the oceans formed on day two. Land animals—and, later, human beings—are made on day six, for the dry land and plants which God created on day three.
Chapter Summary:
Genesis 1 is nothing less than a bare-bones claim that God created the universe. Setting all of the debates on models and interpretations aside, the chapter undeniably insists on one thing: God means to be known as the Creator of all things. Written in the original Hebrew language according to a rigid, poetic structure, the chapter unfolds in a series of patterns and revelations. For those who believe these words, our response should be nothing less than to worship our Maker.
Chapter Context:
Genesis 1 is the first chapter of what came to be known as the Pentateuch: the first five books of the Bible. Likely written by Moses, Genesis 1 begins the story of God and His relationship with His people Israel. The role of God as Creator is not only important for setting up His work in later chapters, but also in His supremacy and authority for all of the other words of the Scriptures. God intends first to be known to all peoples as the Creator of all things—from sun, moon, and stars, to human life itself. And as the Creator, He is owed worship by all He has made, including and especially human beings
Book Summary:
The book of Genesis establishes fundamental truths about God. Among these are His role as the Creator, His holiness, His hatred of sin, His love for mankind, and His willingness to provide for our redemption. We learn not only where mankind has come from, but why the world is in its present form. The book also presents the establishment of Israel, God's chosen people. Many of the principles given in other parts of Scripture depend on the basic ideas presented here in the book of Genesis. Within the framework of the Bible, Genesis explains the bare-bones history of the universe leading up to the captivity of Israel in Egypt, setting the stage for the book of Exodus.
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