Reference for Rosh Hashanah 14:13

אמר רב פפא כי קא חשיב מידי דחייל מאורתא מידי דלא חייל מאורתא לא קא חשיב

R'Nahman B'Isaac said: [The meaning of our Mishnah is], There are four months in which there are a number of New Years.<span class="x" onmousemove="('comment',' There being two in Nisan, and these are counted as one.');">¹¹</span> An objection was raised: 'The sixteenth of Nisan is the New Year for the 'Omer;<span class="x" onmousemove="('comment',' I.e., for making permissible the new corn. Lev. XXIII, 14.');">¹²</span>

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