And Sarai said to Abram, “Look, יהוה has kept me from bearing. Consort with my maid; perhaps I shall have a child through her.” And Abram heeded Sarai’s request. 

So Sarai, Abram’s wife, took her maid, Hagar the Egyptian—after Abram had dwelt in the land of Canaan ten years—and gave her to her husband Abram as concubine.