But indeed she is truly my sister. She is the daughter of my father, but not the daughter of my mother; and she became my wife.
Genesis 20:12
Surrounding context
20:11 And Abraham said, "Because I thought, surely the fear of God is not in this place; and they will kill me on account of my wife.
20:12 But indeed she is truly my sister. She is the daughter of my father, but not the daughter of my mother; and she became my wife.
20:13 And it came to pass, when God caused me to wander from my father's house, that I said to her, "This is your kindness that you should do for me: in every place, wherever we go, say of me, "He is my brother.""'