Commentary for Shabbat 40:2
תני רב יוסף ארבע מדורות אין צריכין רוב של זפת ושל גפרית ושל גבינה ושל רבב במתניתא תנא אף של קש ושל גבבא
and grease.<span class="x" onmousemove="('comment',' I.e., any fatty substance. ');"><sup>3</sup></span> In a Baraitha it was taught: straw and rakings too.<span class="x" onmousemove="('comment',' 'Rakings' refers to small stubble collected in the field. ');"><sup>4</sup></span>
Rashi on Shabbat
Its obvious that wood is not appropriate for a wick, but only for a torch.
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