Genesis 17:21

21 But my covenant I will establish with Isaac, whom Sarah will bear to you by this time next year.”

Read Genesis 17:21 Using Other Translations

But my covenant will I establish with Isaac, which Sarah shall bear unto thee at this set time in the next year.
But I will establish my covenant with Isaac, whom Sarah shall bear to you at this time next year."
But my covenant will be confirmed with Isaac, who will be born to you and Sarah about this time next year.”

What does Genesis 17:21 mean?

John Gill's Exposition of the Bible
Genesis 17:21

But my covenant will one establish with Isaac
The covenant of circumcision; for though Ishmael was circumcised, and his posterity practised that rite, yet it was not enjoined them of God; nor was it to them, or served the same purpose as to the Israelites; and particularly the promise of the land of Canaan, made in that covenant, belonged only to the posterity of Isaac, and to those only in the line of Jacob, and especially that of the Messiah springing from him, which circumcision had a respect unto:

whom Sarah shall bear unto thee, at this set time, in the next year:
that is, at the end of nine months, which is the set time a woman goes with child.

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