لقمٰن — Luqman Ayat 19

وَاقْصِدْ فِيْ مَشْيِكَ وَاغْضُضْ مِنْ صَوْتِكَۗ اِنَّ اَنْكَرَ الْاَصْوَاتِ لَصَوْتُ الْحَمِيْرِ ࣖ

Waqṣid fī masy-yika wagḍuḍ min ṣautik(a), inna ankaral-aṣwāti laṣautul-ḥamīr(i).

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