Hear the Sound of the Shofar!

(7) One who blows into a cistern, or into a cellar or into a barrel; if he heard the sound of the shofar, he has fulfilled [his obligation]; if he heard the sound of an echo, he has not fulfilled [his obligation]. And so [too], he who was passing behind a synagogue, or whose house was adjacent to a synagogue, and heard the sound of a shofar or the sound of [someone reading the] scroll [of Esther, on Purim]; if he [had intention for the commandment], he has fulfilled [his obligation], but if not, he has not fulfilled [his obligation]. Even though this one heard and that one heard, this one [had intention], and that one did not [have intention].

(8) ...A deaf-mute person, or a shoteh, or a minor, cannot relieve others from their obligation [for hearing the shofar they blew the shofar for them]. This is the general rule: all those who are not obligated to carry out a particular action, cannot release [others] from their obligation.

in the first clause, the baraita is dealing with a minor who has reached the age of training in mitzvot. This child is taught to sound the shofar, as one is obligated to teach him the proper way to perform mitzvot. However, here, in the second clause, the baraita is dealing with a minor who has not yet reached the age of training. Although one need not prevent this child from sounding the shofar, one does not encourage him to do so. § The mishna taught: One who acts unawares while sounding the shofar, without any intention to produce a sound, has not fulfilled his obligation. The Gemara infers: One who sounds a shofar for music, even if he has no intention to perform the mitzva, has fulfilled his obligation. The Gemara asks: Let us say that the mishna supports the opinion of Rava, as Rava said: One who sounds a shofar for music has fulfilled his obligation. The Gemara rejects this suggestion. There is no clear proof from here, as perhaps one who sounds a shofar for music is also called one who acts unawares. It is possible that the tanna of the mishna includes in this category anyone who sounds the shofar without a clear intention to fulfill the mitzva. § The mishna continues. And one who hears the shofar blasts from one who acts unawares has not fulfilled his obligation. The Gemara asks: However, one who hears the shofar blasts from one who is sounding the shofar for himself, without intention of sounding it for others, what is the halakha? The mishna apparently indicates that he has fulfilled his obligation. Let us say that this is a conclusive refutation of the opinion of Rabbi Zeira, as Rabbi Zeira said to his attendant: Have the intention to sound the shofar on my behalf and sound it for me. This statement indicates that one must have the intention to enable the one who hears it to fulfill his obligation. The Gemara rejects this argument. Perhaps one can explain that since the first clause of the mishna taught the halakha with regard to one who acts unawares, the latter clause also taught the halakha with regard to one who acts unawares. If so, no inference may be drawn from here to the case of one who sounds the shofar for himself, with no intention of doing so for others.