Genesis 17:21

21 But my covenant I establish with Yitzchak, whom Sarah will bear to you at this set time in the next year."

Genesis 17:21 Meaning and Commentary

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.

Genesis 17:21 In-Context

19 God said, "No, but Sarah, your wife, will bear you a son. You shall call his name Yitzchak. I will establish my covenant with him for an everlasting covenant for his seed after him.

20 As for Yishma'el, I have heard you. Behold, I have blessed him, and will make him fruitful, and will multiply him exceedingly. He will become the father of twelve princes, and I will make him a great nation.

21 But my covenant I establish with Yitzchak, whom Sarah will bear to you at this set time in the next year."

22 When he finished talking with him, God went up from Avraham.

23 Avraham took Yishma'el his son, all who were born in his house, and all who were bought with his money; every male among the men of Avraham's house, and circumcised the flesh of their foreskin in the same day, as God had said to him.