Genesis 12:11

8 And moving on from there to the mountain on the east of Beth-el, he put up his tent, having Beth-el on the west and Ai on the east: and there he made an altar and gave worship to the name of the Lord.

9 And he went on, journeying still to the South.

10 And because there was little food to be had in that land, he went down into Egypt.

11 Now when he came near to Egypt, he said to Sarai, his wife, Truly, you are a fair woman and beautiful to the eye;

12 And I am certain that when the men of Egypt see you, they will say, This is his wife: and they will put me to death and keep you.

13 Say, then, that you are my sister, and so it will be well with me because of you, and my life will be kept safe on your account.

14 And so it was that when Abram came into Egypt, the men of Egypt, looking on the woman, saw that she was fair.