Genesis 16:1-4

1Now Abram’s wife Sarai had borne him no children, but she had an Egyptian maidservant named Hagar. 2So Sarai said to Abram, “Look now, the LORD has prevented me from bearing children. Please go to my maidservant; perhaps I can build a family by her.”

And Abram listened to the voice of Sarai. 3So after he had lived in Canaan for ten years, his wife Sarai took her Egyptian maidservant Hagar and gave her to Abram to be his wife. 4And he slept with Hagar, and she conceived. But when Hagar realized that she was pregnant, she began to despise her mistress.1