Deuteronomy 23:10-15

10“If there is any man among you who is [ceremonially] unclean because of nocturnal emission, then he must go outside the camp; he shall not come back to the camp.

11But when evening comes, he shall bathe in water, and at sundown he may return to the camp.

12“You shall also have a place outside the camp to which you may go,

13and you shall have a spade among your tools, and when you [prepare to] sit down outside [to relieve yourself], you shall dig a hole with it and shall turn and cover up your waste.

14Since the Lord your God walks in the midst of your camp to rescue you and to defeat your enemies before you, therefore your camp must be holy (undefiled); and He must not see anything indecent among you or He will turn away from you.

15“You shall not hand over to his master a slave who has escaped from his master to you.