Sahih Muslim
Sahih Muslim 793 e
It is recommended to make one’s voice beautiful when reciting Qur’an
Arabic hadith text
وَحَدَّثَنَا دَاوُدُ بْنُ رُشَيْدٍ، حَدَّثَنَا يَحْيَى بْنُ سَعِيدٍ، حَدَّثَنَا طَلْحَةُ، عَنْ أَبِي بُرْدَةَ، عَنْ أَبِي مُوسَى، قَالَ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم لأَبِي مُوسَى "لَوْ رَأَيْتَنِي وَأَنَا أَسْتَمِعُ لِقِرَاءَتِكَ الْبَارِحَةَ لَقَدْ أُوتِيتَ مِزْمَارًا مِنْ مَزَامِيرِ آلِ دَاوُدَ "
Translation
Abu Burda narrated on the authority of Abu Musa that the Messenger of Allah (ﷺ) had said to Abu Musa
If you were to see me, as I was listening to your recitation (of the Qur'an) yester-night (you would have felt delighted). You are in fact endowed with a sweet voice like that of David himself.