Genesis 16:3-6

So Sarai, Abram’s wife, took Hagar the Egyptian servant and gave her to Abram as a wife. (This happened ten years after Abram had settled in the land of Canaan.) So Abram had sexual relations with Hagar, and she became pregnant. But when Hagar knew she was pregnant, she began to treat her mistress, Sarai, with contempt. Then Sarai said to Abram, “This is all your fault! I put my servant into your arms, but now that she’s pregnant she treats me with contempt. The LORD will show who’s wrong—you or me!” Abram replied, “Look, she is your servant, so deal with her as you see fit.” Then Sarai treated Hagar so harshly that she finally ran away.