Exodus 4:24 MSG

[24] On the journey back, as they camped for the night, God met Moses and would have killed him but Zipporah took a flint knife and cut off her son’s foreskin, and touched Moses’ member with it. She said, “Oh! You’re a bridegroom of blood to me!” Then God let him go. She used the phrase “bridegroom of blood” because of the circumcision.