Genesis 16:2-4 NRSV
and 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. So, 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. He went in to Hagar, and she conceived; and when she saw that she had conceived, she looked with contempt on her mistress.
NRSV: New Revised Standard Version