Genesis 20:12-13

Young's Literal Translation

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

¹³ and it cometh to pass, when God hath caused me to wander from my father's house, that I say to her, This [is] thy kindness which thou dost with me: at every place whither we come, say of me, He [is] my brother.'