What does Genesis 21:3 mean?
ESV: Abraham called the name of his son who was born to him, whom Sarah bore him, Isaac.
NIV: Abraham gave the name Isaac to the son Sarah bore him.
NASB: Abraham named his son who was born to him, the son whom Sarah bore to him, Isaac.
CSB: Abraham named his son who was born to him--the one Sarah bore to him--Isaac.
NLT: And Abraham named their son Isaac.
KJV: And Abraham called the name of his son that was born unto him, whom Sarah bare to him, Isaac.
NKJV: And Abraham called the name of his son who was born to him—whom Sarah bore to him— Isaac.
Verse Commentary:
Just as God had instructed them (Genesis 17:9), Abraham named his son Isaac, which means "he laughs." The repetition of the phrases here—"the son who was born to him, whom Sarah bore him"—is meant to continue to slow the reader down and force us to ponder what has happened. Two primary points stand out.

First, of course, God kept His promise. He is faithful. He said this would happen, and it did.

Second, Abraham and Sarah were old and well beyond conceiving and bearing children. Further, Sarah had been barren for her entire life up to this point. Genesis intends for us to fully appreciate the idea that Isaac is a miracle baby. A normal married couple might reasonably have ten children, or even more, during their childbearing years, leading to numerous offspring for generations to come. This particular couple, though, through whom would come the nation of Israel, had just one son under miraculous circumstances. There should be no mistake that this birth was anything but the very work of God in the lives of His people.
Verse Context:
Genesis 20:1–7 describes the moment Abraham and Sarah have been waiting on for many, many years. Ever since leaving their home to begin to wander in the land of Canaan, this is a promise they have wished to see fulfilled. God had promised to make Abraham a great nation, by giving him and Sarah a naturally-born son. Finally, their first child together is born. Isaac's name means ''laughter,'' and Sarah expresses her joy at his birth. God has done the unbelievable. He has made laughter for her.
Chapter Summary:
The Lord did as He had promised. Sarah, now 90 years old, gives birth to Isaac, the long-awaited child. Her joy sours, though, over a fear that Isaac might have to share an inheritance with Ishmael. In obedience to the Lord, who promises to safeguard Ishmael, Abraham sends him and his mother, Hagar, into the wilderness. God rescues them and renews His promise to make Ishmael a great nation in his own right. Meanwhile, Abimelech, king of Gerar, approaches Abraham to make a permanent treaty between them and their descendants. The agreement includes Abraham's possession of a well, at a place which will become known as Beersheba.
Chapter Context:
In the prior chapter, Abraham managed to get Sarah back from Abimelech, following his own deception and God's intervention. Here, Abraham and Sarah finally conceive a natural child. Isaac, the long-awaited child of the promise, is born. In obedience to God, Abraham sends Hagar and Ishmael away. Abimelech approaches Abraham to make a treaty, giving Abraham a permanent home in a place that becomes known as Beersheba. In the following chapter, God will test Abraham's faith and obedience, in one of Scripture's ultimate examples of trust.
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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