Reference for Yoma 86:2

אמר אביי כיון דאמר מר משמע מוציא מיד משמע ומשמע ממילא פליג

And the clean person shall sprinkle upon the unclean;<span class="x" onmousemove="('comment',' Num. XIX, 19.');">²</span> 'clean' implies that he was unclean before,<span class="x" onmousemove="('comment',' The word 'tahor' (a clean person) is superfluous, since Scripture just speaks of him, hence it must mean one who is clean again, hence was unclean before. The inference for a tebul-yom (v. Glos.) thus appears justified.');">³</span>

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