Megillah 30A

אמרי: אוקומי הוא דקא מוקמי התם.

Since Shekalim is read from the portion in the Torah immediately following the regular weekly Torah reading, people will mistakenly say that they merely extended the regular reading and then halted there, and they will not realize that the last reading was actually for the sake of Shekalim.

אלא אמר אביי: קרו שיתא מ״ואתה תצוה״ עד ״ועשית״, וחד תני וקרי מ״כי תשא״ עד ״ועשית״.

Rather, Abaye said: 6 people read from “And you should command” until but not including “And you should make a copper laver,” which concludes with the portion used for Shekalim. And then one person repeats and reads Shekalim from “When you take the count” until but not including “And you should make a copper laver.” The repetition of this portion serves to highlight the fact it was read for the sake of Shekalim.

מיתיבי: חל להיות בפרשה הסמוכה לה, בין מלפניה בין מלאחריה ⁠— קורין אותה וכופלין אותה.

The Talmud raises an objection from a baraita: If the Shabbat on which Shekalim is to be read occurs on the Shabbat on which the portion to be read for the regular weekly reading is adjacent to Shekalim, whether on the Shabbat preceding that Shabbat or following it, then they read and repeat Shekalim.

בשלמא לאביי ניחא, אלא לרבי יצחק נפחא קשיא!

Granted, according to the opinion of Abaye, it works out well, for the conclusion of the baraita, that we repeat Shekalim, supports his opinion. But according to the opinion of R' Yitzḥak Nappaḥa, it is difficult.

אמר לך רבי יצחק נפחא: ולאביי מי ניחא? תינח לפניה, לאחריה היכי משכחת לה?

The Talmud answers: R' Yitzḥak Nappaḥa could have said to you: And according to Abaye, does it really work out well? The reference of the baraita to a case where the Shabbat on which Shekalim is read precedes the Shabbat on which that portion will be read as part of the weekly reading works out well, since it can indeed occur. However, with regard to the reference to that Shabbat following the Shabbat on which that portion is read as part of the weekly reading, under what circumstances can this case be found? It never occurs like that.