Dwell alone - More properly, dwell apart; that is, separated from the people.
Though thus excluded from general contact with society, it is not likely that lepers ceased to be objects of sympathy and kindness, such as they now are in those Christian and Moslem countries in which the leprosy prevails. That they associated together in the holy land, as they do at present, is evident from 2 Kings 7:3; Luke 17:12. It has been conjectured that a habitation was provided for them outside Jerusalem, on the hill Gareb (Bezetha), which is mentioned only in Jeremiah 31:39.
Without the camp - Compare the margin reference. A leper polluted everything in the house which he entered. A separate space used to be provided for lepers in the synagogues.