Leviticus 13:46

He shall dwell alone For his humiliation, to prevent the infection of others, and to show the danger of converse with spiritual lepers, or notorious sinners. Without the camp shall his habitation be See Numbers 5:2. In after times they were shut out of the cities, as now out of the camp, (2 Kings 7:3,) and there they dwelt by themselves, 2 Kings 15:5; and so it was among other nations.