Numbers 5:1-4

Then the LORD spoke to Moses, saying, “Command the sons of Israel that they send away from the camp every leper and everyone having a discharge and everyone who is unclean because of a dead person. You shall send away both male and female; you shall send them outside the camp so that they will not defile their camp where I dwell in their midst.” The sons of Israel did so and sent them outside the camp; just as the LORD had spoken to Moses, thus the sons of Israel did.