287. Of the verse, "But his wife looked back from behind him" (Beresheet 19:26), he asks, Why is it written "from behind him" rather than 'from behind her,' namely, behind the Shechinah. AND Rabbi Yosi replies, "from behind him" MEANS from behind Lot, as the Angel of Destruction went behind him. AND HE ASKS, How could THE ANGEL OF DESTRUCTION have followed behind him after sending him away? AND HE REPLIES, The Angel of Destruction refrained from destroying any place where Lot went. But the Angel of Destruction overthrew the place from which he had departed.
288. This is why THE ANGEL OF DESTRUCTION said to him, "Look not behind you," because everything behind you I will destroy. Therefore, it is written, "But his wife looked from behind him," and saw the Angel of Destruction. As a result, "she became a pillar of salt." As long as the Angel of Destruction does not see a person's face, he does not destroy them. But as Lot's wife did turn her face back to look "from behind him," she immediately "became a pillar of salt."