Mesorat%20hashas for Rosh Hashanah 39:5
מתיב רב כהנא כשהמקדש קיים מחללין אף על כולן מפני תקנת הקרבן
R'Kahana raised [against the instruction sent to Mar 'Ukba] the following objection: 'When the Temple stood, Sabbath was profaned for the fixing of all the months, for the sake of the adjustment of the sacrifice'.<span class="x" onmousemove="('comment',' I.e., so that the sacrifice for New Moon should be offered at the proper time.');"><sup>5</sup></span> Now since the reason [for allowing the profanation of the Sabbath] was not in the case of all the other [months] because it is a religious duty to sanctify on the strength of actual observation, neither is the reason in the case of Nisan and Tishri because it is a religious duty to sanctify on the strength of actual observation.<span class="x" onmousemove="('comment',' But, as in the case of all the others, to secure that the New Moon offering should be brought on the proper day.');"><sup>6</sup></span>
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