Mesorat%20hashas for Rosh Hashanah 13:19

אמר רב יהודה אמר שמואל קרבנות צבור הבאין באחד בניסן מצוה להביא מן החדש ואם הביא מן הישן יצא אלא שחיסר מצוה

Has it not been taught: 'A leap year is not decreed<span class="x" onmousemove="('comment',' In the time of the Second Temple the calendar was not fixed, but the Beth din declared any year a leap year (i.e., inserted an intercalary month) according as they judged necessary, subject to certain rules.');">²⁴</span> before New Year,<span class="x" onmousemove="('comment',' Because if this were done, by the time Adar came round people might forget.');">²⁵</span>

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