ותיפוק ליה דהוה ליה יום שנהרג בו גדליה בן אחיקם אמר רב לא נצרכה אלא לאסור את שלפניו

The Gemara raises a difficulty: But if this was at the time that the Temple was standing, derive the prohibition against fasting on the third of Tishrei from the fact that it is the day that Gedaliah, son of Ahikam, was killed. During the time of the Temple the biblical fast days were celebrated as days of joy. Rav said: It was only necessary to include the third of Tishrei in Megillat Ta’anit in order to prohibit fasting on the preceding day as well. Fasting was forbidden not only on the actual days listed in Megillat Ta’anit, but also on the preceding day and the following day.

שלפניו נמי תיפוק ליה דהוה ליה יום שלאחר ר"ח ר"ח דאורייתא ודאורייתא לא בעי חיזוק

The Gemara raises another difficulty: With regard to the prohibition against fasting on the preceding day, the second of Tishrei, also derive it because it is the day after the New Moon, and fasting is forbidden not only on festive days, but also on the preceding day and the following day. The Gemara rejects this argument: The New Moon is by Torah law, and festive days that are by Torah law do not require reinforcement. Therefore no decree was ever enacted prohibiting fasting on the days before and after.

דתניא הימים האלה הכתובין במגילת תענית אסורין בין לפניהם בין לאחריהם שבתות וימים טובים הם אסורים לפניהן ולאחריהן מותרין מה הפרש בין זה לזה הללו דברי תורה ואין דברי תורה צריכין חיזוק הללו דברי סופרים ודברי סופרים צריכין חיזוק

As it is taught in a baraita: These days that are written in Megillat Ta’anit are days on which fasting is prohibited, as are both the day before them and the day after them. With regard to Shabbatot and Festivals, fasting on them is forbidden, but on the day before them and the day after them fasting is permitted. What is the difference between this class of days and that class of days? These days, Shabbatot and Festivals, are by Torah law, and Torah laws do not need reinforcement, and therefore even if a fast day were decreed on the day before or after them, the Festival itself would not be nullified; whereas those days mentioned in Megillat Ta’anit are by rabbinic law, and rabbinic laws need reinforcement, and therefore fasting is prohibited even on the day before and the day after.

ותיפוק ליה דהוה ליה יום שלפני יום שנהרג בו גדליה בן אחיקם א"ר אשי גדליה בן אחיקם דברי קבלה הוא ודברי קבלה כדברי תורה דמו

The Gemara raises yet another difficulty: The prohibition against fasting on the second of Tishrei, derive it from the fact that it is the day before the day that Gedaliah, son of Ahikam, was killed, and since in Temple times the fast of Gedaliah was celebrated as a festive day, fasting should also be prohibited on the preceding day. Rav Ashi said: The fast of Gedaliah, son of Ahikam, is derived from the texts of the tradition, i.e., Prophets and Writings, and as the texts of the tradition are treated like Torah statements for this purpose, they too do not need reinforcement.

מתיב רב טובי בר מתנה בעשרים ותמניא ביה אתת בשורתא טבתא ליהודאי דלא יעידון מאורייתא שגזרה המלכות גזרה שלא יעסקו בתורה ושלא ימולו את בניהם ושיחללו שבתות מה עשה יהודה בן שמוע וחביריו הלכו ונטלו עצה ממטרוניתא אחת שכל גדולי רומי מצויין אצלה

Rav Tovi bar Mattana raised an objection against the opinion that Megillat Ta’anit was nullified, from that which is written in it: On the twenty-eighth of Adar the good tidings came to the Jews that they should not turn away from the Torah, and on that day fasting is forbidden. And this is explained: For the wicked kingdom issued a decree against Israel that they should not occupy themselves with Torah study, and that they should not circumcise their sons, and that they should desecrate Shabbat. What did Yehuda ben Shammua and his colleagues do? They went and took advice from a certain matron [matronita] whom all the prominent men of Rome would visit regularly, thinking that she would know how to annul the decree.

אמרה להם בואו והפגינו בלילה הלכו והפגינו בלילה אמרו אי שמים לא אחיכם אנחנו ולא בני אב אחד אנחנו ולא בני אם אחת אנחנו מה נשתנינו מכל אומה ולשון שאתם גוזרין עלינו גזירות קשות וביטלום ואותו היום עשאוהו יום טוב ואי ס"ד בטלה מגילת תענית קמייתא בטול אחרנייתא מוסיפין

She said to them as follows: Come and cry out [hafgginu] at night in the streets and markets. They went and cried out at night, saying: O Heavens! Are we Jews not your brothers; are we not children of one father; are we not children of one mother? How are we different from every other nation and tongue that you issue such harsh decrees against us? And indeed the decrees were annulled, and the Sages made that day a festive day. And if it enters your mind to say that Megillat Ta’anit has been nullified, can you say that the first prohibitions against fasting they annulled, and then later ones were added?

וכי תימא הכא נמי בזמן שבית המקדש קיים והא יהודה בן שמוע תלמידו של רבי מאיר ור"מ בתר הכי הוה דתנן כלי זכוכית שניקבו והטיף לתוכן אבר אמר רשב"ג יהודה בן שמוע מטמא משום ר"מ

And if you say that here too it is referring to the time when the Temple was standing, there is a difficulty, as Yehuda ben Shammua was a student of Rabbi Meir, and Rabbi Meir was after the destruction of the Temple. And proof that Rabbi Yehuda ben Shammua was a student of Rabbi Meir may be brought, as we learned in a mishna: With regard to glass vessels that had holes in them, which afterward were filled in with lead, the Sages dispute whether the utensil is considered a whole utensil, which can become ritually impure, or whether it is considered a broken utensil, which does not. Rabban Shimon ben Gamliel said: Yehuda ben Shammua declares that it becomes impure, in the name of Rabbi Meir;