Genesis 20:12-18

12 Besides, she is my sister--my father's daughter but not my mother's. She is also my wife.
13 When God had me leave my father's home and travel around, I said to her, 'Do me a favor: Wherever we go, say that I'm your brother.'"
14 Then Abimelech took sheep, cattle, and male and female slaves and gave them to Abraham. He also gave his wife Sarah back to him.
15 Abimelech said, "Look, here's my land. Live anywhere you like."
16 He said to Sarah, "Don't forget, I've given your brother 25 pounds of silver. This is to silence any criticism against you from everyone with you. You're completely cleared."
17 Abraham prayed to God, and God healed Abimelech, his wife, and his female slaves so that they could have children.
18 (The LORD had made it impossible for any woman in Abimelech's household to have children because of Abraham's wife Sarah.)