Thematic Bible: Is sterile; gives her handmaiden, hagar, to abraham as a concubine

Now Sarai, Abram's wife, had borne him no children. She had an Egyptian maid whose name was Hagar. And Sarai said to Abram, See here, the Lord has restrained me from bearing [children]. I am asking you to have intercourse with my maid; it may be that I can obtain children by her. And Abram listened to and heeded what Sarai said. So Sarai, Abram's wife, took Hagar her Egyptian maid, after Abram had dwelt ten years in the land of Canaan, and gave her to her husband Abram to be his [secondary] wife.