1 Chronicles 1:28
The sons of Abraham: Isaac, and Ishmael.
Genesis 16:11-16
And the angel of Jehovah said unto her, Behold, thou art with child, and shalt bear a son; and thou shalt call his name Ishmael, because Jehovah hath heard thy affliction.
Genesis 17:19-21
And God said, Nay, but Sarah thy wife shall bear thee a son; and thou shalt call his name Isaac: and I will establish my covenant with him for an everlasting covenant for his seed after him.
Genesis 21:2-5
And Sarah conceived, and bare Abraham a son in his old age, at the set time of which God had spoken to him.
Genesis 21:9-10
And Sarah saw the son of Hagar the Egyptian, whom she had borne unto Abraham, mocking.
Genesis 21:12
And God said unto Abraham, Let it not be grievous in thy sight because of the lad, and because of thy handmaid. In all that Sarah saith unto thee, hearken unto her voice. For in Isaac shall thy seed be called.