1 Chronicles 1:28
The sons of Abraham: Isaac and Ishmael.
Genesis 16:11-16
Then the Lord's angel said to her, "You are now pregnant and are about to give birth to a son. You are to name him Ishmael, for the Lord has heard your painful groans.
Genesis 17:19-21
God said, "No, Sarah your wife is going to bear you a son, and you will name him Isaac. I will confirm my covenant with him as a perpetual covenant for his descendants after him.
Genesis 21:2-5
So Sarah became pregnant and bore Abraham a son in his old age at the appointed time that God had told him.
Genesis 21:9-10
But Sarah noticed the son of Hagar the Egyptian -- the son whom Hagar had borne to Abraham -- mocking.
Genesis 21:12
But God said to Abraham, "Do not be upset about the boy or your slave wife. Do all that Sarah is telling you because through Isaac your descendants will be counted.