Reference for Shevuot 75:14

תא שמע מדידיה ר' מאיר אומר אפילו חטה ושעורה וכוסמת חייב על כל אחת ואחת תני חטה שעורה כוסמת

- But does the Tanna go on so frequently blundering?<span class="x" onmousemove="('comment',' The Tanna inserts and, and you say it must be omitted in all these instances; a Tanna is always very careful and exact.');">¹⁶</span> - Well then, it is the view of Rabbi,<span class="x" onmousemove="('comment',' The anonymous statements in our Mishnah, which imply that and denotes a particular, are not the view of R. Meir (according to Samuel) , but of Rabbi.');">¹⁷</span>

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