ENOfficial
Al-Barā’ b. ‘Āzib told that he heard God's messenger say, "Beautify the Qur’ān with your voices, for the beautiful voice increases the beauty of the Qur’ān.” Dārimī transmitted it.
Source: sunnah.com
Other translations
Arabic
وَعَنِ الْبَرَاءِ بْنِ عَازِبٍ رَضِيَ اللَّهُ عَنْهُ قَالَ: سَمِعْتُ رَسُولَ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ يَقُولُ: «حَسِّنُوا الْقُرْآنَ بِأَصْوَاتِكُمْ فَإِنَّ الصَّوْتَ الْحَسَنَ يُزِيدُ الْقُرْآنَ حُسْنًا» . رَوَاهُ الدَّارمِيّ
sunnah.com