Genesis 26:9-11

9Then Abimelech called Isaac, and said, Behold, she is certainly thy wife; and how saidst thou, She is my sister? and Isaac said to him, Because I said, Lest I die on account of her.

10And Abimelech said, What is this thou hast done to us? But a little and one of the people might have lain with thy wife, and thou wouldest have brought a trespass on us.

11And Abimelech charged all the people, saying, He that touches this man or his wife shall certainly be put to death.