Genesis 12:10-13

¹⁰Now there was a famine in the land; so Abram went down to Egypt to sojourn there, for the famine was severe in the land. ¹¹It came about when he came near to Egypt, that he said to Sarai his wife, “See now, I know that you are a beautiful woman; ¹²and when the Egyptians see you, they will say, ‘This is his wife’; and they will kill me, but they will let you live. ¹³Please say that you are my sister so that it may go well with me because of you, and that I may live on account of you.”