1 Chronicles 1:28
The sons of Abraham: Isaac and Ishmael.
Genesis 16:11-16
And the LORD's angel said further unto her, "See, thou art with child and shalt bear a son, and shalt call his name Ishmael: because the LORD hath heard thy tribulation.
Genesis 17:19-21
Then said God, "Nay. Sara thy wife shall bear thee a son, and thou shalt call his name Isaac. And I will make my covenant with him, that it shall be an everlasting covenant unto his seed after him.
Genesis 21:2-5
And Sara was with child and bare Abraham a son in his old age, even the same season which the LORD had appointed.
Genesis 21:9-10
Sara saw the son of Hagar the Egyptian, which she had borne unto Abraham, a mocking.
Genesis 21:12
Then the LORD said unto Abraham, "Let it not be grievous unto thee, because of the lad and of thy bondmaid: But in all that Sara hath said unto thee, hear her voice, for in Isaac shall thy seed be called.