Exodus 4
24 Ref Now on the journey, at the night's resting-place, the Lord came in his way and would have put him to death.
25 Ref Then Zipporah took a sharp stone, and cutting off the skin of her son's private parts, and touching his feet with it, she said, Truly you are a husband of blood to me.
26 So he let him go. Then she said, You are a husband of blood because of the circumcision.