Commentary for Pesachim 108:9

מלאכה תנינא מקום שנהגו לעשות מלאכה בתשעה באב עושין ובמקום שנהגו שלא לעשות אין עושין ואפילו רשב"ג לא אמר אלא דכי יתיב ולא עביד לא מיחזי כיוהרא אבל מיסר לא אסר

What does 'its doubt is permitted' mean? Surely [that refers to] twilight? - No, [but] as R'Shisha the son of R'Idi said,<span class="x" onmousemove="('comment',' v. infra.');">¹⁴</span> It is in respect of the fixing of New Moon; so here too it is in respect of the fixing of the New Moon.<span class="x" onmousemove="('comment',' E.g., if a man is in the wilderness and does not know what day was fixed as New Moon, he must observe two Days of Atonement (his doubt could only be whether the previous month had consisted of twenty-nine days or thirty days) , but only one day as the Ninth of Ab.');">¹⁵</span>

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