The law in regard to lepers was particularly severe, for they were denied the right of staying within the camp, whereas the unclean were prohibited merely from staying near the sanctuary. The lepers were the very ones who had worshipped the Golden Calf, and had as a consequence been smitten with this disease, and it was for this reason that God separated them from the community. Thirteen sins are punished with leprosy by God: blasphemy, unchastity, murder, false suspicion, pride, illegal appropriation of the rights of others, slander, theft, perjury, profanation of the Divine Name, idolatry, envy, and contempt of the Torah.
Goliath was stricken with leprosy because he reviled God; the daughters of Zion became leprous in punishment of their unchastity; leprosy was Cain's punishment for the murder of Abel. When Moses said to God, "But behold, they will not believe me," God replied: "O Moses, art thou sure that they will not believe thee? They are believers and the sons of believers. Thou who didst suspect them wrongly, put not they hand into thy bosom,.....and he put his hand into his bosom: and when he took it out, behold, his hand was leprous as snow. " Uzziah presumed upon the rights of the priesthood, and went into the Temple to burn incense upon the altar of incense.
He was just about to commit the offence, when "the leprosy brake forth in his forehead." Leprosy fell upon Naaman, who had grown arrogant because of his heroic deeds. For slandering Moses Miriam became leprous as snow; and Gehazi was punished by leprosy because he frustrated the purpose of Elisha, who desired to accept nothing from Naaman in order that the cure might redound to the glory of God.