Genesis 20:10-13

10Whatever possessed you to do such a thing?”

11Abraham replied, “I thought, ‘This is a godless place. They will want my wife and will kill me to get her.’

12And she really is my sister, for we both have the same father, but different mothers. And I married her.

13When God called me to leave my father’s home and to travel from place to place, I told her, ‘Do me a favor. Wherever we go, tell the people that I am your brother.’”