Genesis 17:21
ESV
But I will establish my covenant with Isaac, whom Sarah shall bear to you at this time next year."
NIV
But my covenant I will establish with Isaac, whom Sarah will bear to you by this time next year."
NASB
But I will establish My covenant with Isaac, whom Sarah will bear to you at this season next year.'
CSB
But I will confirm my covenant with Isaac, whom Sarah will bear to you at this time next year."
NLT
But my covenant will be confirmed with Isaac, who will be born to you and Sarah about this time next year.'
KJV
But my covenant will I establish with Isaac, which Sarah shall bear unto thee at this set time in the next year.
NKJV
But My covenant I will establish with Isaac, whom Sarah shall bear to you at this set time next year.”
What does Genesis 17:21 mean?
Here, God concludes His revelations to the newly renamed Abraham for this encounter. Unlike earlier visits from God with their grand unconditional promises and few details, God's words to Abraham, now 99 years old, have been overwhelmingly specific.In addition to changing Abraham's name, God has commanded Abraham to walk before him and to be blameless. He has commanded Abraham to circumcise himself and all the males in his household. God has also changed Sarai's name to Sarah, revealing that she will bear a son and that son will be the one to whom God's covenant promises will pass. Ishmael, now 13, will be greatly blessed, but his will not be the covenant people of God.
Finally, in this verse, God reveals for the first time a timeline for his promises. By this time next year, a boy named Isaac will be born to Abraham and Sarah.
One can only imagine how much Abraham's head must have been spinning.
Genesis 17:15–27 describes God's surprising revelation to the newly renamed, 99-year-old Abraham: His presumably barren, 89-year-old wife, Sarai, now to be named Sarah, would bear him a son within a year. Ishmael, now 13, would still be abundantly blessed, but this new son, Isaac, would be the one through whom God would keep His covenant promises. As soon as God left, Abraham immediately set about obeying God's command to circumcise himself and every male in his household as a sign of the covenant with the Lord.
God appears to Abram once more in Genesis 17, but this instance is very different from prior meetings. God reconfirms His promises to make Abram a father of nations and to give to him and his descendants the land of Canaan. This time, though, God changes Abram's name to Abraham and gives him a requirement to circumcise himself and every male in his household forever. He also changes Sarai's name to Sarah. God announces that Abraham and Sarah will have a son, after all. His 13-year old son Ishmael will be blessed, but this new son, Isaac, to be born within the year, will be the one to whom God's covenant promises will pass.
