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

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.