Genesis 20:11-13

11And Abraham said, Because I thought, Surely the fear of God is not in this place; and they will slay me for my wife’s sake. 12And yet indeed she is 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 thy kindness which thou shalt show to me; at every place where we shall come, say of me, He is my brother.