Taanit 14A

והא שייר תיבה! אי משום תיבה ⁠— לאו שיורא הוא. מילי דצינעא ⁠— קתני, מילי דבפרהסיא ⁠— לא קתני.

But he omitted any mention of the ark and the halakha that during the last 7 fast days the ark was brought into the streets of the city. The Talmud rejects this argument: If the omission is due to the ark, that is not a real omission. The reason is that the tanna teaches only matters that are performed in private, whereas he does not teach matters that are performed in public [parhesya].

אמר רב אשי: מתניתין נמי דיקא, דקתני: מה אלו יתירות על הראשונות, אלא שבאלו מתריעין ונועלין את החנויות. אבל בכל דבריהן ⁠— זה וזה שוין. וכי תימא הכא נמי תנא ושייר, והא ״מה אלו״ קתני.

Rav Ashi said: The wording of the Mishnah is also precise, according to this explanation, as it teaches: How are these 7 fast days more stringent than the first ones? Rather, the difference is that on these days, in addition to all the earlier stringencies, they sound the alarm and they lock the stores. However, in regard to all their other matters, both this and that are identical. And if you say that here too he taught and omitted, but it teaches: How are these more stringent, an expression that indicates that the Mishnah states the only difference.

ותסברא ״מה אלו״ דווקא הוא? והא שייר לה תיבה! אי משום תיבה ⁠— לאו שיורא הוא, משום דקא חשיב לה באידך פרקא. השתא דאתית להכי: עשרים וארבעה נמי לאו שיורא הוא, דקתני לה באידך פירקא.

The Talmud asks: And how can you understand the phrase: How are these, specifically, as indicating that there is only one difference between the cases? But he omitted the ark. The Talmud responds: If the omission is due to the ark, that is not a real omission, because the tanna includes it in another chapter (15a). The Talmud comments: Now that you have arrived at this solution, a similar answer can be applied to the earlier difficulties. The matter of the 24 blessings is also not an omission, as he teaches this halakha in another chapter, also on 15a, where the Mishnah provides further details of the blessings. Here, however, the tanna lists only those matters that are not discussed later.