Exodus 4:24 - 4:26
24 Now it happened at the lodging place on the way that Yahweh encountered him and sought to put him to death. 25 Then Zipporah took a flint and cut off her son’s foreskin and touched his feet with it, and she said, “You are indeed a bridegroom of blood to me!” 26 So He let him alone. At that time she said, “You are a bridegroom of blood” with reference to the circumcision.