Numbers 5:1-4 - Rules Concerning Those Unclean
1 And the LORD spake unto Moses, saying, 2 "Command the children of Israel that they put out of the host all the lepers and all that have issues and all that are defiled upon the dead; 3 whether they be males or females ye shall put them out of the host, that they defile not the tents among which I dwell." 4 And the children of Israel did so, and put them out of the host: even as the LORD commanded Moses, so did the children of Israel.