וישא עיניו וירא והנה שלשה אנשים נצבים עליו
Rashi explains that it was necessary to send three angels in the image of men because an angel performs only one mission. Thus, one angel came to heal Avraham Avinu; the second came to inform Sarah Imeinu of the impending birth of her son; the third came to destroy Sodom. Raphael, the angel who healed Avraham, went on to Sodom to save Lot form the conflagration that would destroy the city. The question is obvious: If an angel performs only one mission (at a time), and Rapahel had gone on to destroy Sodom to save Lot, would it not have been…
