en_tn_condensed/lev/15/02.md

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comes out of his body

This refers to the man's private parts. (See: rc://en/ta/man/jit/figs-euphemism)

he becomes unclean

The person whom other people may not touch is spoken of as if he were physically unclean. (See: rc://en/ta/man/jit/figs-metaphor)