Commentary for Shabbat 97:6

<big><strong>גמ׳</strong></big> א"ר ינאי תפילין צריכין גוף נקי כאלישע בעל כנפים מאי היא אביי אמר שלא יפיח בהן רבא אמר שלא יישן בהן

— Come and hear: [WE MAY NOT STORE&nbsp;…] IN STRAW, GRAPE-SKINS, FLOCKING OR HERBAGE WHEN THEY ARE MOIST. Now, if you say [that it means] artificially moistened, it is well; but if you say, naturally moist, how can flocking be naturally moist? — [It is possible] in the case of wool plucked from between the flanks.<span class="x" onmousemove="('comment',' Of a living animal: this contains its own moisture. ');">⁵</span>

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