وَاقْصِدْ فِي مَشْيِكَ وَاغْضُضْ مِن صَوْتِكَ إِنَّ أَنكَرَ الْأَصْوَاتِ لَصَوْتُ الْحَمِيرِ

Be modest in your bearing, and lower your voice. Indeed the ungainliest of voices is the donkey’s voice.’