صَحِيحُ مُسْلِمٍ
Sahih Muslim 793 e
The Book of Prayer - Travellers
It is recommended to make one’s voice beautiful when reciting Qur’an
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 .
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.
Sahih Muslim, 793 eSahihصحيح