Commentary for Arakhin 18:7
אין עצרת חלה אלא ביום הנף ואין ר"ה חלה אלא או ביום הנף או לאור עיבורו
and the New Year can fall only on either the day of the waving or the day following the night of the last day of the full month [of Nisan].<span class="x" onmousemove="('comment',' Or iburo, the night of its being made a full month, because upon the night depends its completeness, for if the new moon is proclaimed for the thirty-first day, that fact renders the month just passed full (one of thirty days) .');"><sup>4</sup></span>
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