Responsa for Moed Katan 6:8
ואמר ר' שמעון בן פזי אמר רבי יהושע בן לוי משום בר קפרא רבן גמליאל ובית דינו נמנו על שני פרקים הללו ובטלום
'He was astonished for a while';<span class="x" onmousemove="('comment',' A phrase from Daniel IV, 16. R. Abbahu or R. Johanan was for the moment puzzled for a reply.');"><sup>10</sup></span> then he replied: I say, they thus have stipulated among themselves that whoever might thereafter wish to abrogate that [measure] could come and abrogate it.<span class="x" onmousemove="('comment',' Should the exigencies of the time demand it.');"><sup>11</sup></span> But was it their measure?
Teshuvot Maharam
You asked about a community that wished to declare a fast on Monday, Thursday and Monday, and the first fast day fell on Tu Bishvat. Should they be concerned and postpone the fast to the following week or not? Thus my inclination is that the fast should be postponed to the following week, and the fast should not be set because we do not find any fast on Rosh Hashanah.
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