Genesis 12:13 (KJV)

And he removed from thence unto a mountain on the east of Bethel, and pitched his tent, having Bethel on the west, and Hai on the east: and there he builded an altar unto the LORD, and called upon the name of the LORD.

And Abram journeyed, going on still toward the south.

And there was a famine in the land: and Abram went down into Egypt to sojourn there; for the famine was grievous in the land.

And it came to pass, when he was come near to enter into Egypt, that he said unto Sarai his wife, Behold now, I know that thou art a fair woman to look upon:

Therefore it shall come to pass, when the Egyptians shall see thee, that they shall say, This is his wife: and they will kill me, but they will save thee alive.

And it came to pass, that, when Abram was come into Egypt, the Egyptians beheld the woman that she was very fair.

The princes also of Pharaoh saw her, and commended her before Pharaoh: and the woman was taken into Pharaoh's house.

And he entreated Abram well for her sake: and he had sheep, and oxen, and he asses, and menservants, and maidservants, and she asses, and camels.

And the LORD plagued Pharaoh and his house with great plagues because of Sarai Abram's wife.

And Pharaoh called Abram and said, What is this that thou hast done unto me? why didst thou not tell me that she was thy wife?