Jerusalem Talmud Rosh Hashanah 3.3

משנה: שׁוֹפָר שֶׁל רֹאשׁ הַשָּׁנָה שֶׁל יָעֵל פָּשׁוּט וּפִיו מְצוּפֶּה זָהָב וּשְׁתֵּי חֲצוֹצְרוֹת מִן הַצְּדָדִין. שׁוֹפָר מַאֲרִיךְ וַחֲצוֹצְרוֹת מְקַצְּרוֹת שֶׁמִּצְוַת הַיּוֹם בַּשּׁוֹפָר:

MISHNAH: The shofar of New Year’s Day is a straight one from a mountain goat, around its mouthpiece covered with gold, and two trumpets by its sides. The shofar is long and the trumpets short because the obligation of the day is by the shofar.

הלכה: אָמַר רִבִּי יוֹנָה. כְּדֵי שֶׁיִּפְשְׁטוּ לִבָּם בִּתְשׁוּבָה.

HALAKHAH: Rebbi Jonah said, so they should straighten out their thoughts in repentance.

פִּיו מְצוּפֶּה זָהָב. צִּיפָּהוּ זָהָב מִבִּפְנִים פָּסוּל. מִבַּחוּץ כָּשֵׁר. צִּיפָּהוּ מְקוֹם הַנָּחַת פִּיו אוֹ שֶׁהָיָה קוֹלוֹ עָבֶה מַחְמַת הַצִּיפּוּי פָּסוּל.

“Around its mouthpiece covered with gold.” If it was gilded inside it is disqualified, outside it is qualified. If he gilded it at the mouthpiece or if its sound became heavy because of the gilding it is disqualified.

אָמַר רִבִּי יוֹסֵה. הָדָא אָ‍מְרָה. פְּשׁוּטָה שֶׁשָּׁמַע מִקְצָתָהּ מִן הַמִּתְעַסֵּק [לֹא] יָצָא. וְהֵיי דָא אָ‍מְרָה דָא. תָּקַע בָּרִאשׁוֹנָה וּמָשַׁךְ בַּשְּׁנִיָיה כִשְׁתַּיִם אֵין בְּיָדוֹ אֶלָּא אֶחָת. רִבִּי אַבָּא בַּר זְמִינָא בְשֵׁם רִבִּי זְעוּרָה. אֲפִילוּ אַחַת אֵין בְיָדוֹ. לָמָּה. רֹאשָׁהּ גַּבֵּי סוֹפָהּ מִצְטָרֵף וְסוֹפָהּ גַּבֵּי רֹאשָׁהּ מִצְטָרֵף. לֹא רֹאשָׁהּ אִית לָהּ סוֹף וְלֹא סוֹפָהּ אִית לָהּ רֹאשׁ.

Rebbi Yose said, this implies that one who heard part of a straight sound from one who was practicing did [not] fulfill his obligation. And where is this said? “If he blew straight for the first set and continued a double length for the second he has only one in his hand.” Rebbi Abba bar Zamina in the name of Rebbi Ze`ira: Not even one is in his hand. Why? The beginning combines with the end and the end combines with the beginning. The first part has no end and the second part has no beginning.