Seder Hadoros relates that Ramban once confronted his former student, named Avner, and asked him why he had strayed from the path of observant Judaism.  Avner replied that Ramban had once taught that "everything is to be found in the Song of Haázinu" and Avner found the idea so utterly preposterous that it led him to lose faith. When Ramban stated that he still held by his assertion, Avner