Genesis 20:10

8Abimelech rose early in the morning, and called all his servants, and told all these things in their ear. The men were very scared.

9Then Abimelech called Abraham, and said to him, “What have you done to us? How have I sinned against 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!”

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

11Abraham said, “Because I thought, ‘Surely the fear of God is not in this place. They will kill me for my wife’s sake.’

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