Genesis 20:1-3

1From there Abraham traveled to the region of the Negev and settled between Kadesh and Shur. While he was staying in Gerar,

2Abraham said about his wife Sarah, “She is my sister.” So King Abimelech of Gerar had Sarah brought to him.

3But God came to Abimelech in a dream by night and said to him, “You are about to die because of the woman you have taken, for she is a married woman.”