Genesis 20:2

20:2 Abraham said about his wife Sarah, “She is my sister.” So Abimelech, king of Gerar, sent for Sarah and took her.

Genesis 20:5

20:5 Did Abraham not say to me, ‘She is my sister’? And she herself said, ‘He is my brother.’ I have done this with a clear conscience and with innocent hands!”

Genesis 20:12-13

20:12 What’s more, she is indeed my sister, my father’s daughter, but not my mother’s daughter. She became my wife. 20:13 When God made me wander from my father’s house, I told her, ‘This is what you can do to show your loyalty to me: Every place we go, say about me, “He is my brother.”’”