عَنْ عَلِيِّ بْنِ مُحَمَّدٍ النَّوْفَلِيِّ عَنْ اَبِي الْحَسَنِؑ قَالَ ذَكَرْتُ الصَّوْتَ عِنْدَهُ فَقَالَ اِنَّ عَلِيَّ بْنَ الْحُسَيْنِؑ كَانَ يَقْرَاُ الْقُرْآنَ فَرُبَّمَا مَرَّ بِهِ الْمَارُّ فَصَعِقَ مِنْ حُسْنِ صَوْتِهِ وَ اِنَّ الْاِمَامَ لَوْ اَظْهَرَ مِنْ ذٰلِكَ شَيْئًا لَمَا احْتَمَلَهُ النَّاسُ مِنْ حُسْنِهِ قُلْتُ وَ لَمْ يَكُنْ رَسُولُ اللهِ ﷺ يُصَلِّي بِالنَّاسِ وَ يَرْفَعُ صَوْتَهُ بِالْقُرْآنِ فَقَالَ اِنَّ رَسُولَ اللهِ ﷺ كَانَ يَحْمِلُ النَّاسَ مِنْ خَلْفِهِ مَا يُطِيقُونَ
Ali Ibn Muhammad al-Naufeli reports, “I mentioned the voice (for recitation of Quran) in front of Imam al-Kazem (peace be upon him). He (peace be upon him) said, ‘Surely, Ali Ibn al-Husain (peace be upon him) used to recite Quran. Often, a person passing by when (Imam was reciting) used to faint on account of the beauty of his voice. Surely, if an Imam manifests from this even one thing (i.e. even a fraction), the people will not be able to bear its beauty.’ I asked, ‘Did the Messenger of Allah (peace be upon him and his holy progeny) not pray behind the people and raise his voice in reciting the Quran?’ He (peace be upon him) informed, ‘Surely, the Messenger of Allah (peace be upon him and his holy progeny) used to impose on the people behind him what they could bear (i.e. within their capacity)’.”
References:
1. Behaar al-Anwaar, vol. 25, p. 164, H. 32 باب 4- جامع في صفات الإمام و شرائط الإمامة 2. Al-Kaafi, vol. 2, p. 615, H. 4 with slight variation