Genesis 4:15

15And the Lord said to him: “By no means will it be so; rather, whoever would kill Cain, will be punished sevenfold.” And the Lord placed a seal upon Cain, so that anyone who found him would not put him to death.
4:15 Set a mark, etc: The more common opinion of the interpreters of holy writ supposes this mark to have been a trembling of the body; or a horror and consternation in his countenance.(Challoner)

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