Reference for Rosh Hashanah 37:4

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

- R'Ashi replied: The fast of Gedaliah the son of Ahikam is laid down in the later Scriptures,<span class="x" onmousemove="('comment',' Viz., Zechariah. Lit., 'words of Kabbalah. V. supra p., 23 n. 10.');">⁶</span> and the words of the later Scriptures are on the same footing as those of the Torah. R'Tobi B'Mattenah raised the following objection [against the statement that Megillath Ta'anith has been annulled]: '"On the twenty-eighth thereof [of Adar] came glad tidings to the Jews that they should not abandon the practice of the Law".

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