Genesis 17:21
“But my covenant will I establish with Isaac, which Sarah shall bear unto thee at this set time in the next year.”
And God said, Sarah thy wife shall bear thee a son indeed; and thou shalt call his name Isaac: and I will establish my covenant with him for an everlasting covenant, and with his seed after him.
And as for Ishmael, I have heard thee: Behold, I have blessed him, and will make him fruitful, and will multiply him exceedingly; twelve princes shall he beget, and I will make him a great nation.
But my covenant will I establish with Isaac, which Sarah shall bear unto thee at this set time in the next year.
And he left off talking with him, and God went up from Abraham.
And Abraham took Ishmael his son, and all that were born in his house, and all that were bought with his money, every male among the men of Abraham’s house; and circumcised the flesh of their foreskin in the selfsame day, as God had said unto him.
Cross-References
“Is any thing too hard for the Lord? At the time appointed I will return unto thee, according to the time of life, and Sarah shall have a son.”
“And the Lord visited Sarah as he had said, and the Lord did unto Sarah as he had spoken.”
“For this is the word of promise, At this time will I come, and Sara shall have a son.”
“And he said, About this season, according to the time of life, thou shalt embrace a son. And she said, Nay, my lord, thou man of God, do not lie unto thine handmaid.”
“For Sarah conceived, and bare Abraham a son in his old age, at the set time of which God had spoken to him.”