God was ill pleased with Moses for this artifice, and He spake to him, saying, "Joseph prophesied long ago that the oppression of Egypt would endure only two hundred and ten years." For his lack of faith Moses was punished while he was on the road to Egypt. The angels Af and Hemah appeared and swallowed his whole body down to his feet, and they gave him up only after Zipporah, nimble as a "bird," circumcised her son Gershom, and touched the feet of her husband with the blood of the circumcision. The reason why their son had remained uncircumcised until then was that Jethro had made the condition, when he consented to the marriage of his daughter with Moses, that the first son of their union should be brought up as a Gentile.