Commentary for Rosh Hashanah 37:7

וכי תימא הכא נמי בזמן שבית המקדש קיים והא יהודה בן שמוע תלמידו של רבי מאיר ור"מ בתר הכי הוה דתנן כלי זכוכית שניקבו והטיף לתוכן אבר אמר רשב"ג יהודה בן שמוע מטמא משום ר"מ

Now if you maintain that the Megillath Ta'anith<span class="x" onmousemove="('comment',' I.e., those days that were inserted in the list before the destruction of the Temple.');">⁹</span> was annulled, [is it possible that] after the earlier prohibitions had been annulled they should add new ones? And should you reply that this also was in the period when the Temple was still standing, [this cannot be], because Judah B'Shammu'a was the disciple of R'Meir, and R'Meir was after the destruction of the Temple. We know [that R'Judah was R'Meir's disciple] because it has been taught: 'If holes were made in a vessel of glass and filled up with lead, R'Simeon B'Gamaliel reports that R'Judah B'Shammu'a in the name of R'Meir declares it unclean,<span class="x" onmousemove="('comment',' Supposing it had been unclean, it now reverts to the uncleanness which it had lost when it was broken, v. Shab. 15b. Or it may mean vsuvh 'becomes capable of receiving uncleanness'. V. Rashi a.l. and Tosaf. s.v. .');">¹⁰</span>

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