Galatians 4:22
For it is written, that, Abraham, had two sons - one by the bondmaid, and one by the free woman;
Genesis 16:15
So Hagar bare to Abram a son, - and Abram called the name of his son, whom Hagar bare, Ishmael.
Genesis 16:2-4
So then Sarai said unto Abram Behold, I pray thee, Yahweh hath restrained me, from bearing, go in I pray thee unto, my handmaid, peradventure I may be built up from, her, And Abram hearkened to the voice of Sarai.
Genesis 21:1-2
Now, Yahweh, visited Sarah, as he had said, - And Yahweh did for Sarah as he had spoken.
Genesis 21:10
So she said to Abraham, Cast out this bondwoman and her son, - for the son of this bondwoman must not inherit with my son with Isaac.