Genesis 16:1-3

1Now Sarai, Abram’s wife, had borne him no children. And she had an Egyptian maidservant whose name was Hagar.

2So Sarai said to Abram, “See now, the Lord has restrained me from bearing children. Please, go in to my maid; perhaps I shall obtain children by her.” And Abram heeded the voice of Sarai.

3Then Sarai, Abram’s wife, took Hagar her maid, the Egyptian, and gave her to her husband Abram to be his wife, after Abram had dwelt ten years in the land of Canaan.