Commentary for Shabbat 249:5
במאי קמיפלגי אמר אביי בעושין מעין מלאכה ואין עושין מעין מלאכתן קמיפלגי ואזדא ר' יהודה לטעמיה ור"מ לטעמיה
Our Rabbis taught: The fragments of an old oven<span class="x" onmousemove="('comment',' I.e., one that has already been fired, so that the clay whereof it is made is hardened and fit for its work. ');"><sup>3</sup></span>
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