Gen 16:1-3

The Birth of Ishmael 1Now Sarai, Abram's wife, bore him no children. She had an Egyptian slave-girl whose name was Hagar,2and Sarai said to Abram, “You see that the Lord has prevented me from bearing children; go in to my slave-girl; it may be that I shall obtain children by her.” And Abram listened to the voice of Sarai.3So, after Abram had lived ten years in the land of Canaan, Sarai, Abram's wife, took Hagar the Egyptian, her slave-girl, and gave her to her husband Abram as a wife.