Defilement: Those Under, Removed from the Camp
Source: TTT
Numbers 5:3, 4
You must send away male and female alike; send them outside the camp so they will not defile their camp, where I dwell among them.” / So the Israelites did this, sending such people outside the camp. They did just as the LORD had instructed Moses.
Deuteronomy 23:14
For the LORD your God walks throughout your camp to protect you and deliver your enemies to you. Your camp must be holy, lest He see anything unclean among you and turn away from you.