Genesis 12:10-13

At this time there was not much food in the land, so Abram went down to Egypt to live because there was so little food. Just before they arrived in Egypt, he said to his wife Sarai, “I know you are a very beautiful woman. When the Egyptians see you, they will say, ‘This woman is his wife.’ Then they will kill me but let you live. Tell them you are my sister so that things will go well with me and I may be allowed to live because of you.”