Finally Zipporah took a flint and cut off her son’s foreskin and caused it to touch his feet and said: ‘It is because you are a bridegroom of blood to me.’

Logically, therefore, Zipporah would have caused the foreskin (the evidence of having complied with the covenant) to touch the angel’s feet and thus show that there was now no reason for her son to die.

Zipporah’s unusual expression, “You are a bridegroom of blood to me,” was evidently made because circumcision involved a covenant. The author of that covenant was Jehovah God as here represented by His angel. Hence, in addressing Jehovah through his representative angel as a “bridegroom of blood,” Zipporah appears to have been, not speaking critically, but acknowledging her own submission now to the terms of that covenant. It was as if she had accepted a wifely position in the circumcision covenant, with Jehovah God as the husband. By this act of obedience to God’s proper requirement, the life of her son was no longer in danger.