Genesis 20:12-13

EJ2000(i) 12 And yet indeed, she is also my sister; she is the daughter of my father, but not the daughter of my mother; and she became my wife. 13 And it came to pass when God caused me to wander from my father’s house that I said unto her, This is the mercy which thou shalt show unto me: at every place where we shall come, say of me, He is my brother.