Genesis 17:21

For this is the word of promise, At this time will I come, and Sarah shall have a son.

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.

And if ye be Christ’s, then are ye Abraham’s seed, and heirs according to the promise.

As he spake to our fathers, to Abraham, and to his seed for ever.

And Israel took his journey with all that he had, and came to Beersheba, and offered sacrifices unto the God of his father Isaac.

Moreover he said, I am the God of thy father, the God of Abraham, the God of Isaac, and the God of Jacob. And Moses hid his face; for he was afraid to look upon God.

And he said unto them, It is not for you to know the times or the seasons, which the Father hath put in his own power.

To perform the mercy promised to our fathers, and to remember his holy covenant;

And God heard their groaning, and God remembered his covenant with Abraham, with Isaac, and with Jacob.

By faith he sojourned in the land of promise, as in a strange country, dwelling in tabernacles with Isaac and Jacob, the heirs with him of the same promise:

O that thou wouldest hide me in the grave, that thou wouldest keep me secret, until thy wrath be past, that thou wouldest appoint me a set time, and remember me!

And he blessed Joseph, and said, God, before whom my fathers Abraham and Isaac did walk, the God which fed me all my life long unto this day,