Deuteronomy 23:9-14
9“When you go out as 1an army against your enemies, you shall keep yourself from every evil thing.
10“aIf there is among you any man who is unclean because of a nocturnal emission, then he must go outside the camp; he may not 1reenter the camp. 11“But it shall be when evening approaches, he shall bathe himself with water, and at sundown he may 1reenter the camp.
12“You shall also have a place outside the camp and go out there, 13and you shall have a 1spade among your tools, and it shall be when you sit down outside, you shall dig with it and shall turn 2to cover up your excrement. 14“Since aYahweh your God walks in the midst of your camp to deliver you and to give your enemies over to you, therefore your camp must be bholy; and He must not see 1anything indecent among you, 2or He will turn away from you.