Deuteronomy 23:12

Revised Standard Version (RSV-CI)

“You shall have a place outside the camp and you shall go out to it;

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but when evening comes on, he shall bathe himself in water, and when the sun is down, he may come within the camp.

and you shall have a stick with your weapons; and when you sit down outside, you shall dig a hole with it, and turn back and cover up your excrement.

“And if a man has an emission of semen, he shall bathe his whole body in water, and be unclean until the evening.