Numbers 5:1-4

And the LORD spoke to Moses, saying: “Command the children of Israel that they put out of the camp every leper, everyone who has a discharge, and whoever becomes defiled by a corpse. You shall put out both male and female; you shall put them outside the camp, that they may not defile their camps in the midst of which I dwell.” And the children of Israel did so, and put them outside the camp; as the LORD spoke to Moses, so the children of Israel did.