Qur'an 31:19 Luqman

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."

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