Responsa for Moed Katan 6:7
ר' שמעון אומר א"כ נתנה תורה שיעור לכל אחד ואחד בידו אלא בשדה הלבן עד הפסח ובשדה האילן עד העצרת וב"ה אומרים עד הפסח
and abrogated them. Said R'Zera to R'Abbahu, some say, Resh Lakish said to R'Johanan: How could Rabban Gamaliel and his Beth din abrogate a measure instituted by Beth Shammai and Beth Hillel? Surely we learned: 'No Beth din has power to nullify the words [ruling] of another Beth din unless it be superior to it in learning and number'!<span class="x" onmousemove="('comment',' 'Ed. I, 5.');"><sup>9</sup></span>
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.
Ask RabbiBookmarkShareCopy