Reference for Rosh Hashanah 51:6

ורבנן כדרב מתנה דאמר רב מתנה מאי שור פר שהוא גדול כפר

The fact is that shor par is equivalent to shofar.<span class="x" onmousemove="('comment',' With inserted as is found in many Hebrew nouns, Strashun.]');">⁹</span> And the Rabbis? - They adopt the explanation of R'Mattenah; for R'Mattenah said: What is meant by shor par? A shor which is as full-grown as a par.<span class="x" onmousemove="('comment',' The name shor could be applied to the animal at birth; the name par not till it entered its third year. V. supra, 10a,');">¹⁰</span>

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