Arachin (2:1):
אֵין בָּעֲרָכִין פָּחוּת מִסֶּלַע, וְלֹא יָתֵר עַל חֲמִשִּׁים סָלַע. כֵּיצַד, נָתַן סֶלַע וְהֶעֱשִׁיר, אֵינוֹ נוֹתֵן כְּלוּם. פָּחוֹת מִסֶּלַע וְהֶעֱשִׁיר, נוֹתֵן חֲמִשִּׁים סָלַע. הָיָה בְיָדָיו חָמֵשׁ סְלָעִים, רַבִּי מֵאִיר אוֹמֵר, אֵינוֹ נוֹתֵן אֶלָּא אֶחָת. וַחֲכָמִים אוֹמְרִים, נוֹתֵן אֶת כֻּלָּם. אֵין בָּעֲרָכִין פָּחוּת מִסֶּלַע, וְלֹא יָתֵר עַל חֲמִשִּׁים סֶלַע.
There is no (case in) Arachin (where one pays) less than one sela, nor more than 50 sela. How so (what is the Halacha in the following cases)? If he (promised 50 but only had enough to) give a sela, and then became rich, he is not obligated to give anything. If he had less than a sela and became rich, he must give 50 sela (because he wasn’t yotzei with less than a sela). If he had 5 sela (and promised 50) Rabbi Meir says he only gives one, and Chachamim say he must give all 5. There is no (case in) Arachin (where one pays) less than one sela, nor more than 50 sela.
Why is the ending (in italics) a repeat of the beginning?