And I will bless her, and give thee a son also of her: yea, I will bless her, and she shall be a mother of nations; kings of people shall be of her.(Genesis 17:16)

Then Abraham fell upon his face, and laughed, and said in his heart, Shall a child be born unto him that is an hundred years old? and shall Sarah, that is ninety years old, bear?(Genesis 17:17)

And Abraham said unto God, O that Ishmael might live before thee!(Genesis 17:18)

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.(Genesis 17:20)

But my covenant will I establish with Isaac, which Sarah shall bear unto thee at this set time in the next year.(Genesis 17:21)

And he left off talking with him, and God went up from Abraham.(Genesis 17:22)

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Genesis 17:19 - Cross Reference

Not as though the word of God hath taken none effect. For they are not all Israel, which are of Israel: (Romans 9:6)

But my covenant will I establish with Isaac, which Sarah shall bear unto thee at this set time in the next year. (Genesis 17:21)

Sojourn in this land, and I will be with thee, and will bless thee; for unto thee, and unto thy seed, I will give all these countries, and I will perform the oath which I sware unto Abraham thy father; (Genesis 26:3)

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. (2 Kings 4:16)

And he said, I will certainly return unto thee according to the time of life; and, lo, Sarah thy wife shall have a son. And Sarah heard it in the tent door, which was behind him. (Genesis 18:10)

But the angel said unto him, Fear not, Zacharias: for thy prayer is heard; and thy wife Elisabeth shall bear thee a son, and thou shalt call his name John. (Luke 1:13)

For Sarah conceived, and bare Abraham a son in his old age, at the set time of which God had spoken to him. (Genesis 21:2)

And Sarah said, God hath made me to laugh, so that all that hear will laugh with me. (Genesis 21:6)

Now we, brethren, as Isaac was, are the children of promise. (Galatians 4:28)