Reference for Rosh Hashanah 38:7

הא מיקלקל ר"ה מוטב תיקלקל ראש השנה ולא יתקלקלו כולהו מועדות

- It is better that New Year should be interfered with than that all the festivals should be interfered with. There is also an indication [that this view is correct in the language of the Mishnah], which states, OF TISHRI FOR THE ADJUSTMENT OF THE FESTIVALS.

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