Benefits of the Hadith: (Abu Mahdhura (may Allah be pleased with him) that the Prophet (peace and blessings be upon him) was pleased with his voice, so he taught him the adhan).

The Shaykh : In this, there are benefits: First: choosing one with a beautiful voice for the adhan. Second: it is befitting for the one in authority to teach the mu'adhdhins how to call to prayer, either through courses, meaning he establishes courses in every town for a period of one week, two weeks, one month, or two months, according to what the need requires. The evidence for this is his saying: And he did not limit himself to Abu Mahdhura hearing the adhan from Bilal, but the Prophet (peace and blessings be upon him) taught him himself.
And from the benefits of the hadith: there is no harm for the supreme imam in teaching the general public, because the Prophet (peace and blessings be upon him) taught Abu Mahdhura the adhan himself. He does not elevate himself and say: let one of the people teach it, but he teaches it himself, following the example of whom? The Messenger (peace and blessings be upon him), and seeking reward, because when a person teaches another something of the Shari'ah and he acts upon it, he has the reward of the one who taught him "Narrated by Ibn Khuzaymah" Yes.