Exodus 4:24-26

And it came to pass on the way at the lodging-place, that Jehovah met him, and sought to kill him. Then Zipporah took a flint, and cut off the foreskin of her son, and cast it at his feet; and she said, Surely a bridegroom of blood art thou to me. So he let him alone. Then she said, A bridegroom of blood art thou, because of the circumcision.