Reference for Pesachim 38:7

רוקין תנינא דתנן כל הרוקין הנמצאין בירושלים טהורין חוץ משל שוק העליון לא צריכא אף על גב דאיתחזק זב

Said Rab Judah in Rab's name: E.g. , if one lost a needle [unclean through] a person defiled by the dead,<span class="x" onmousemove="('comment',' I.e, the needle had been defiled by him.The person is a 'father' of uncleanness, and the needle is likewise, because metal in such a case has the same degree of uncleanness as that which defiles it; v. supra ');">¹¹</span> and he recognized it in

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