1 Chronicles 1:28
The sons of Abraham: Isaac, and Ishmael.
Genesis 16:11-16
And the agent of LORD said to her, Behold, thou are with child, and shall bear a son, and thou shall call his name Ishmael, because LORD has heard thy affliction.
Genesis 17:19-21
And God said, No, but Sarah thy wife shall bear thee a son, and thou shall 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 bore 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 to Abraham, mocking.
Genesis 21:12
And God said to Abraham, Let it not be grievous in thy sight because of the lad, and because of thy handmaid. In all that Sarah says to thee, hearken to her voice. For in Isaac shall thy seed be called.