(And be moderate in your pace) just as in His saying: (And do not walk on the earth insolently). (And lower your voice; indeed, the most disagreeable of sounds) meaning: the ugliest (is the voice of donkeys).
Muhammad said: The meaning of (aghḍuḍ - lower) is: reduce. The meaning is that He informed him of the ugliness of raising one's voice during conversation and arguing by comparing it to the ugliness of the voices of donkeys, because they are loud.
Surat Luqman, from verse 20 to verse 22.
﴿واقصد فِي مشيك﴾ كَقَوْلِهِ: ﴿وَلا تَمْشِ فِي الأَرْضِ مرحا﴾ ﴿وَاغْضُضْ مِنْ صَوْتِكَ إِنَّ أَنْكَرَ الْأَصْوَات﴾ يَعْنِي: أقبح ﴿لصوت الْحمير﴾.
قَالَ مُحَمَّد: معنى (اغضض): انْقُصْ؛ الْمَعْنَى: عَرَّفَهُ قُبْحَ رَفْعِ الْصَوْتِ فِي الْمُخَاطَبَةِ وَالْمُلَاحَاةِ بِقُبْحِ أصوات الْحمير؛ لِأَنَّهَا عالية.
سُورَة لُقْمَان من (آيَة ٢٠ آيَة ٢٢).
