Genesis 16
2 Ref And Sarai said to Abram, See, the Lord has not let me have children; go in to my servant, for I may get a family through her. And Abram did as Sarai said.
3 Ref So after Abram had been living for ten years in the land of Canaan, Sarai took Hagar, her Egyptian servant, and gave her to Abram for his wife.
4 Ref And he went in to Hagar and she became with child, and when she saw that she was with child, she no longer had any respect for her master's wife.