He said, "I will certainly return to you when the season comes round. Behold, Sarah your wife will have a son." Sarah heard in the tent door, which was behind him.
TSK
TSK · Genesis 17:21
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Sarah conceived, and bore Abraham a son in his old age, at the set time of which God had spoken to him.
Yahweh appeared to him, and said, "Don't go down into Egypt. Live in the land I will tell you about.
He blessed Joseph, and said, "The God before whom my fathers Abraham and Isaac did walk, the God who has fed me all my life long to this day,
Moreover he said, "I am the God of your father, the God of Abraham, the God of Isaac, and the God of Jacob." Moses hid his face; for he was afraid to look at God.
As he spoke to our fathers, to Abraham and his seed forever."
He said to them, "It isn't for you to know times or seasons which the Father has set within his own authority.
For this is a word of promise, "At the appointed time I will come, and Sarah will have a son."
By faith, he lived as an alien in the land of promise, as in a land not his own, dwelling in tents, with Isaac and Jacob, the heirs with him of the same promise.