Deuteronomy 23:10-15

10If there is a man among you who is unclean because of a bodily emission during the night, he must go outside the camp; he may not come anywhere inside the camp.

11When evening approaches, he is to wash with water, and when the sun sets he may come inside the camp.

12You are to have a place outside the camp and go there to relieve yourself.

13You are to have a digging tool in your equipment; when you relieve yourself, dig a hole with it and cover up your excrement.

14For the Lord your God walks throughout your camp to protect you and deliver your enemies to you; so your encampments must be holy. He must not see anything indecent among you or he will turn away from you.

15“Do not return a slave to his master when he has escaped from his master to you.