Genesis 20:1-3

1And Abraham journeyed from there to the South, and dwelt between Kadesh and Shur, and stayed in Gerar.

2Now Abraham said of Sarah his wife, “She is my sister.” And Abimelech king of Gerar sent and took Sarah.

3But God came to Abimelech in a dream by night, and said to him, “Indeed you are a dead man because of the woman whom you have taken, for she is a man’s wife.”