1 Chronicles 1:28
The sons of Abraham: Isaac, and Ishmael.
Genesis 16:11-16
The angel of Yahweh said to her, "Behold, you are with child, and will bear a son. You shall call his name Ishmael, because Yahweh has heard your affliction.
Genesis 17:19-21
God said, "No, but Sarah, your wife, will bear you a son. You shall call his name Isaac. I will establish my covenant with him for an everlasting covenant for his seed after him.
Genesis 21:2-5
Sarah conceived, and bore Abraham a son in his old age, at the set time of which God had spoken to him.
Genesis 21:9-10
Sarah saw the son of Hagar the Egyptian, whom she had borne to Abraham, mocking.
Genesis 21:12
God said to Abraham, "Don't let it be grievous in your sight because of the boy, and because of your handmaid. In all that Sarah says to you, listen to her voice. For from Isaac will your seed be called.