Dr. Mustafa Khattab, the Clear Quran - Surah Luqman, ayah 19

Translation of Surah Luqman, ayah 19 (31:19)

وَٱقۡصِدۡ فِي مَشۡيِكَ وَٱغۡضُضۡ مِن صَوۡتِكَۚ إِنَّ أَنكَرَ ٱلۡأَصۡوَٰتِ لَصَوۡتُ ٱلۡحَمِيرِ ١٩
Be moderate in your pace. And lower your voice, for the ugliest of all voices is certainly the braying of donkeys.”