Quran 31:19 — Surah Luqman, ayah 19

وَٱقۡصِدۡ فِي مَشۡيِكَ وَٱغۡضُضۡ مِن صَوۡتِكَۚ إِنَّ أَنكَرَ ٱلۡأَصۡوَٰتِ لَصَوۡتُ ٱلۡحَمِيرِ

And be moderate in your pace and lower your voice; indeed, the most disagreeable of sounds is the voice of donkeys

U hodu budi odmjeren, a u govoru ne budi grlat; ta najneprijatniji glas je revanje magarca!"