Then Zipporah took a sharp stone, and cut off the foreskin of her son, and cast it at his feet, and said, Surely a bloody husband are you to me.
All Commentaries on Exodus 4:25 Go To Exodus 4
Jerome
AD 420
As regards Moses, it is clear that he would have been in peril at the inn, if Zipporah, which is by interpretation “a bird,” had not circumcised her son and cut off the foreskin of marriage with the knife which prefigured the gospel.