Genesis 20:10-12

Young's Literal Translation

¹⁰ Abimelech also saith unto Abraham, `What hast thou seen that thou hast done this thing?'

¹¹ And Abraham saith, `Because I said, `Surely the fear of God is not in this place, and they have slain me for the sake of my wife;

¹² and also, truly she is my sister, daughter of my father, only not daughter of my mother, and she becometh my wife;