Genesis 20:9-13

Then Abimelech called Abraham and said to him, “What have you done to us? And how have I sinned against you, that you have brought on me and on my kingdom a great sin? You have done to me things that ought not to be done.”

And Abimelech said to Abraham, “What have you encountered, that you have done this thing?”

Abraham said, “Because I thought, surely there is no fear of God in this place, and they will kill me because of my wife.

Besides, she actually is my sister, the daughter of my father, but not the daughter of my mother; and she became my wife;

and it came about, when God caused me to wander from my father’s house, that I said to her, ‘This is the kindness which you will show to me: everywhere we go, say of me, “He is my brother.” ’ ”