Rebbi says: Great is circumcision, all of Moses' merits not standing for him in his duress. When the L–rd told him "Take out My people, the children of Israel from the land of Egypt," because he was lax for a short time in (the) circumcision (of his son), the angel sought to kill him, viz. (Exodus 4:24) "and he was on the way in the lodging, etc."