Galatians 4:22

For it is written that Abraham had two sons, one by the female slave and one by the free woman.

Genesis 16:15

And Hagar had a child for Abram, a son. And Abram called the name of his son whom Hagar bore to him, Ishmael.

Genesis 16:2-4

And Sarai said to Abram, "Look, please, Yahweh has prevented me from bearing children. Please go in to my servant; perhaps {I will have children by her}." And Abram listened to the voice of Sarai.

Genesis 21:1-2

And Yahweh visited Sarah as he had said. And Yahweh did to Sarah as he had promised.

Genesis 21:10

Then she said to Abraham, "Drive out this slave woman and her son, for the son of this slave woman will not be heir with my son, with Isaac."

Treasury of Scripture Knowledge

Summary

Galatians 4:22

For it is written, that Abraham had two sons, the one by a bondmaid, the other by a freewoman.

That

Genesis 16:2

Genesis 21:1

Bible References

That

And Sarai said to Abram, "Look, please, Yahweh has prevented me from bearing children. Please go in to my servant; perhaps {I will have children by her}." And Abram listened to the voice of Sarai.

And Yahweh visited Sarah as he had said. And Yahweh did to Sarah as he had promised.