Genesis 17:21

17:21 But I will establish my covenant with Isaac, whom Sarah will bear to you at this set time next year.”

Genesis 21:2

21:2 So Sarah became pregnant and bore Abraham a son in his old age at the appointed time that God had told him.

Genesis 21:2

21:2 So Sarah became pregnant and bore Abraham a son in his old age at the appointed time that God had told him.

Genesis 4:16-17

4:16 So Cain went out from the presence of the Lord and lived in the land of Nod, east of Eden.

The Beginning of Civilization

4:17 Cain had marital relations with his wife, and she became pregnant and gave birth to Enoch. Cain was building a city, and he named the city after his son Enoch.