Genesis 20:8-13

8So Abimelech rose early in the morning, called all his servants, and told all these things in their hearing; and the men were very much afraid.

9And Abimelech called Abraham and said to him, “What have you done to us? How have I offended you, that you have brought on me and on my kingdom a great sin? You have done deeds to me that ought not to be done.”

10Then Abimelech said to Abraham, “What did you have in view, that you have done this thing?”

11And Abraham said, “Because I thought, surely the fear of God is not in this place; and they will kill me on account of my wife.

12But indeed she is truly my sister. She is the daughter of my father, but not the daughter of my mother; and she became my wife.

13And it came to pass, when God caused me to wander from my father’s house, that I said to her, ‘This is your kindness that you should do for me: in every place, wherever we go, say of me, “He is my brother.” ’ ”