Deuteronomy 23:10-13

10If one of your men becomes unclean from a nocturnal emission, he must go outside the camp and stay there.

11Toward evening he must wash, and at sunset he may come back to camp.

12Choose a place outside the camp where you can go ⌞to relieve yourself⌟.

13You must carry a pointed stick as part of your equipment. When you go outside to squat, dig a hole with it. When you’re done, cover up your excrement.