9 For this is what the promise specified: “At the appointed time I will return, and Sarah will have a son.”
Romans 9:9 Cross References - VIN
Genesis 17:21
21 "But my covenant I will establish with Isaac. Sarah will bear him to you by this time next year."
Genesis 18:10
10 And he said, "I will certainly return to you ⌊in the spring⌋, and look, Sarah your wife will have a son." Now Sarah was listening at the doorway of the tent, and which was behind him.
Genesis 18:14
14 Is anything too hard for the LORD? At the set time I will return to you, when the season comes round and Sarah will have a son.
Genesis 21:2
2 Sarah became pregnant and bore a son to Abraham in his old age. It was at the very time God had promised him.
Hebrews 11:11-12
11 By faith Sarah, even though she was barren and beyond the opportune age, was enabled to conceive a child, because she considered Him faithful who had promised.
12 And so from one man, and he as good as dead, came descendants as numerous as the stars in the sky and as countless as the sand on the seashore.
Hebrews 11:17
17 By faith Abraham, when he was tested, offered up Isaac on the altar. He who had received the promises was ready to offer his one and only son,