كتاب صلاة المسافرين وقصرها
6  
The Book of Prayer - Travellers
(34)
Chapter: It is recommended to make one’s voice beautiful when reciting Qur’an
(34)
باب اسْتِحْبَابِ تَحْسِينِ الصَّوْتِ بِالْقُرْآنِ ‏
Sahih Muslim 793 e

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.
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 ‏"‏ ‏.‏
Reference : Sahih Muslim 793e
In-book reference : Book 6, Hadith 280
USC-MSA web (English) reference : Book 4, Hadith 1735
  (deprecated numbering scheme)