Quran 31:19

وَٱقْصِدْ فِى مَشْيِكَ وَٱغْضُضْ مِن صَوْتِكَ ۚ إِنَّ أَنكَرَ ٱلْأَصْوَٰتِ لَصَوْتُ ٱلْحَمِيرِ

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

Translation · Saheeh International