Exodus 4:24-26

24Now at a lodging place along the way, the LORD met Moses1 and was about to kill him. 25But Zipporah took a flint knife, cut off her son’s foreskin, and touched it to Moses’ feet.2 “Surely you are a bridegroom of blood to me,” she said.

26So the LORD let him alone. (When she said, “bridegroom of blood,” she was referring to the circumcision.)