Deuteronomy 23:10

New American Bible - revised edition

When in camp during an expedition against your enemies, you shall keep yourselves from anything bad.

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

If one of you becomes unclean because of a nocturnal emission, he shall go outside the camp; he shall not come back into the camp.

Children born to them may come into the assembly of the Lord in the third generation. Cleanliness in Camp.

But be careful not to covet or take anything that is under the ban; otherwise you will bring upon the camp of Israel this ban and the misery of it.