Related for Rosh Hashanah 4:8
שׁוֹפָר שֶׁל רֹאשׁ הַשָּׁנָה, אֵין מַעֲבִירִין עָלָיו אֶת הַתְּחוּם, וְאֵין מְפַקְּחִין עָלָיו אֶת הַגַּל, לֹא עוֹלִין בְּאִילָן, וְלֹא רוֹכְבִין עַל גַּבֵּי בְהֵמָה, וְלֹא שָׁטִין עַל פְּנֵי הַמַּיִם, וְאֵין חוֹתְכִין אוֹתוֹ בֵּין בְּדָבָר שֶׁהוּא מִשּׁוּם שְׁבוּת, וּבֵין בְּדָבָר שֶׁהוּא מִשּׁוּם לֹא תַעֲשֶׂה. אֲבָל אִם רָצָה לִתֵּן לְתוֹכוֹ מַיִם אוֹ יַיִן, יִתֵּן. אֵין מְעַכְּבִין אֶת הַתִּינוֹקוֹת מִלִּתְקוֹעַ, אֲבָל מִתְעַסְּקִין עִמָּהֶן עַד שֶׁיִּלְמְדוּ. וְהַמִּתְעַסֵּק, לֹא יָצָא, וְהַשּׁוֹמֵעַ מִן הַמִּתְעַסֵּק, לֹא יָצָא:
The shofar of Rosh Hashanah — the tchum is not crossed for it [i.e., It is forbidden to go outside the tchum in order to bring a shofar or to go to hear the blowing], and a mound (that has fallen on it) is not dug up (to extract it). It is forbidden to climb a tree, to ride an animal, or to swim (for its sake). And it may not be cut, both with something interdicted because of shvuth ("resting") [such as a knife] or with something which is interdicted by negative commandment, [as with a saw, which is an absolute labor in woodworking. Some understand it in the opposite manner: "something interdicted by reason of shvuth" — a sickle, which it is not the practice to cut (objects) with. "something interdicted by negative commandment" — a knife, which is used for cutting.] But if he wishes to put water or wine therein, he may do so, [and we do not say that he is amending an object thereby.] We do not stop the children [who have reached the age of chinuch (mitzvah training)] from blowing it [even on Shabbath, in order to train them for mitzvoth, that they gain practice in blowing for the yom tov of Rosh Hashanah], and one may (even) practice with them. [And there is no reason to decree lest he come to carry it four cubits in the public domain, for he is not preoccupied with a mitzvah, but just practicing, and they decreed lest he come to carry it four cubits in the public domain only at a time when he was obligated in the blowing of shofar, when, being preoccupied with fulfilling his obligation, he might forget the Sabbath.] And one who (merely) practices (blowing the shofar) does not fulfill his obligation. And one who hears from one who practices does not fulfill his obligation.