Deuteronomy 23:10-14

“If there is among you any man who is unclean because of a nocturnal emission, then he must go outside the camp; he may not reenter the camp.

But when evening approaches, he shall bathe himself with water, and at sundown he may reenter the camp.

“You shall also have a place allocated outside the camp, so that you may go out there to relieve yourself,

and you shall have a spade among your tools, and it shall be when you sit down outside, you shall dig with it and shall turn and cover up your excrement.

Since the Lord your God walks in the midst of your camp to save you and to defeat your enemies before you, your camp must be holy; so He must not see anything indecent among you or He will turn away from you.