Reference for Rosh Hashanah 66:4

דלמא איידי דתנא רישא מתעסק תנא סיפא נמי מתעסק:

If so, this would be a refutation of R'Zera; for R'Zera said to his attendant, 'Blow with intent to clear me<span class="x" onmousemove="('comment',' From the obligation of blowing the shofar.');">⁵</span> also'!<span class="x" onmousemove="('comment',' This would show that in R. Zera's opinion it was not sufficient to hear another blowing merely for himself.');">⁶</span> - Perhaps our authority having mentioned 'practising' in the first clause used the same expression in the second.<span class="x" onmousemove="('comment',' But he meant to include one blowing for himself');">⁷</span>

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