But 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."
Genesis 20:3
Surrounding context
20:2 Now Abraham said of Sarah his wife, "She is my sister." And Abimelech king of Gerar sent and took Sarah.
20:3 But 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."
20:4 But Abimelech had not come near her; and he said, "Lord, will You slay a righteous nation also?