Genesis 20:12-16

Besides, she actually is my sister, the daughter of my father, but not the daughter of my mother; and she became my wife;

and it came about, when God caused me to wander from my father’s house, that I said to her, ‘This is the kindness which you will show to me: everywhere we go, say of me, “He is my brother.” ’ ”

Abimelech then took sheep and oxen and male and female servants, and gave them to Abraham, and returned his wife Sarah to him.

Abimelech said, “Behold, my land is before you; settle wherever you please.”

To Sarah he said, “Look, I have given your brother a thousand pieces of silver. It is your vindication before all who are with you, and before everyone you are cleared.”