Numbers 5:2-4

Command the children of Israel, that they put out of the camp every leper, and every one that hath an issue, and whosoever is defiled by the dead: both male and female shall ye put out, without the camp shall ye put them; that they defile not their camps, in the midst whereof I dwell. And the children of Israel did so, and put them out without the camp: as the LORD spake unto Moses, so did the children of Israel.