Reference for Rosh Hashanah 51:3
<big><strong>מתני׳</strong></big> כל השופרות כשרים חוץ משל פרה מפני שהוא קרן אמר רבי יוסי והלא כל השופרות נקראו קרן שנאמר (יהושע ו, ה) במשוך בקרן היובל:
But in this case even R'Akiba would agree [that a witness may act as judge]. <big><b>MISHNAH: </b></big>ALL KINDS OF SHOFAR<span class="x" onmousemove="('comment',' A kind of trumpet made of the horn of certain animals. Scripture prescribes (Lev. XXV, 9) that a shofar should be used for proclaiming the Jubilee. The Psalmist also says (Ps. LXXXI, 4) , Blow ye the shofar on the new moon.');"><sup>2</sup></span> MAY BE USED EXCEPT [ONE MADE FROM THE HORN] OF A COW, BECAUSE IT IS [PROPERLY] KEREN.<span class="x" onmousemove="('comment',' I.e., all kinds of horns may be used for making a shofar except that of a cow, because an instrument made from a cow's horn, though similar to a shofar in all respects, is properly called keren (lit. 'horn')');"><sup>3</sup></span>
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