The Saheeh International Quran Translation
وَٱقْصِدْ فِى مَشْيِكَ وَٱغْضُضْ مِن صَوْتِكَ إِنَّ أَنكَرَ ٱلْأَصْوَٰتِ لَصَوْتُ ٱلْحَمِيرِ
تجهيز للطباعة
And be moderate in your pace and lower your voice; indeed, the most disagreeable of sounds is the voice of donkeys."