Numbers 5:1-4
On Defilement
1 Then the Lord spoke to Moses, saying,
2 “Command the sons of Israel that they (A)send away from the camp every leper and everyone having a (B)discharge and everyone who is (C)unclean because of a dead person.
3 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 (D)in their midst.”
4 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.