Responsa for Moed Katan 6:2
ר' אלעזר אמר חרישה והכי קאמר יכול ילקה על חרישה דאתיא מכלל ופרט וכלל ונסיב ליה תלמודא לפטורא
But [said he], I know not which was the teaching, nor what was [actually] meant by 'extension'. R'Eleazar [b. Pedath] said that the 'extension' had reference to [the inclusion of] 'ploughing' [as a punishable offence], and the argument proceeded thus: Possibly [you might say] that he should be flogged for 'ploughing' [in the sabbatical year], the rule being inferred by [treating the sabbatical ordinance as a cas of] General-Particular-General; then the teaching was concluded to prove exemption.
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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