Luqman, 19 Ayah
31:19
وَٱقۡصِدۡ فِي مَشۡيِكَ وَٱغۡضُضۡ مِن صَوۡتِكَۚ إِنَّ أَنكَرَ ٱلۡأَصۡوَٰتِ لَصَوۡتُ ٱلۡحَمِيرِ ١٩
Wāqşid Fī Mashyika Wa Aghđuđ Min Şawtika ۚ 'Inna 'Ankara Al-'Aşwāti Laşawtu Al-Ĥamīri
And be moderate in your pace and lower your voice; indeed, the most disagreeable of sounds is the voice of donkeys."