2 For Sarah conceived, and bore Abraham a son in his old age, at the set time of which God had spoken to him.
Genesis 21:2 Cross References - KJ2000
Genesis 17:19
19 And God said, Sarah your wife shall bear you a son indeed; and you shall call his name Isaac: and I will establish my covenant with him for an everlasting covenant, and with his descendants after him.
Genesis 17:21
21 But my covenant will I establish with Isaac, whom Sarah shall bear unto you at this set time in the next year.
Genesis 18:10
10 And he said, I will certainly return unto you according to the time of life; and, lo, Sarah your wife shall have a son. And Sarah heard it in the tent door, which was behind him.
Genesis 18:14
14 Is anything too hard for the LORD? At the time appointed I will return unto you, according to the time of life, and Sarah shall have a son.
2 Kings 4:16-17
Luke 1:24-25
Luke 1:36
36 And, behold, your cousin Elizabeth, she has also conceived a son in her old age: and this is the sixth month with her, who was called barren.
Acts 7:8
8 And he gave him the covenant of circumcision: and so Abraham begat Isaac, and circumcised him the eighth day; and Isaac begat Jacob; and Jacob begat the twelve patriarchs.
Romans 9:9
9 For this is the word of promise, At this time will I come, and Sarah shall have a son.
Galatians 4:22
22 For it is written, that Abraham had two sons, the one by a bondmaid, the other by a free woman.
Hebrews 11:11
11 Through faith also Sara herself received strength to conceive, and was delivered of a child when she was past age, because she judged him faithful who had promised.