Reference for Chullin 47:45

מכאן לתלמיד שלא ראה סימן יפה במשנתו ה' שנים שוב אינו

And the other, [R'Jose]? - He would say that the Temple service is an exception, for its rules are difficult.<span class="x" onmousemove="('comment',' Because of the numerous details that had to be mastered; and, therefore, in such a case even R. Jose admits that five years are necessary.');">²⁶</span>

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