2 And Sarah conceived and bore a son to Abraham in his old age, at the time appointed, that which God had spoken with him.
Genesis 21:2 Cross References - LITV
Genesis 17:19
19 And God said, Your wife Sarah truly shall bear you a son, and you shall call his name Isaac. And I have established My covenant with him for a perpetual covenant with his seed after him.
Genesis 17:21
21 And I will establish My covenant with Isaac, whom Sarah shall bear to you at this time next year.
Genesis 18:10
10 And He said, I will certainly return to you at the time of life; and, Behold! A son shall be to your wife Sarah. And Sarah was listening at the entrance to the tent, and it was behind Him.
Genesis 18:14
14 Is anything too difficult for Jehovah? At the appointed time I will return to you, at the time of life, and there will be a son to Sarah.
2 Kings 4:16-17
Luke 1:24-25
Luke 1:36
36 And behold, your kinswoman Elizabeth! She also conceived a son in her old age, and this is the sixth month to her who was called barren;
Acts 7:8
8 And He gave to him a covenant of circumcision; and so he fathered Isaac and circumcised him on the eighth day. And Isaac fathered Jacob, and Jacob the twelve patriarchs.
Romans 9:9
9 For the word of promise is this, According to this time I will come, and a son will be to Sarah. Gen. 18:10
Galatians 4:22
22 For it has been written, Abraham had two sons, one out of the slave woman and one out of the free woman.
Hebrews 11:11
11 Also by faith Sarah herself received power for conceiving seed even beyond the time of age, and gave birth; since she deemed the One having promised to be faithful.