Deuteronomy 23:10-12

New International Version - UK

¹⁰ If one of your men is unclean because of a nocturnal emission, he is to go outside the camp and stay there. ¹¹ But as evening approaches he is to wash himself, and at sunset he may return to the camp.

¹² Designate a place outside the camp where you can go to relieve yourself.