Genesis 20:9-12

9Abimelech called Abraham to come to him. He said to Abraham, ‘Why have you done this bad thing against us? I have not done anything wrong against you. Now you have made me and the people in my kingdom guilty of a very bad thing. Nobody should ever do the things that you have done to me.’

10Abimelech asked Abraham, ‘What caused you to do this?’

11Abraham replied, ‘I did it because I was afraid. I thought, “The people here do not respect God. They will kill me so that they can take my wife from me.”

12And also, she really is my sister. She is the daughter of my father. But she is not the daughter of my mother. And she became my wife.