Abd-Allāh ibn al-Mubārak [may Allāh have mercy on him] said:
“Whomsoever belittles the scholars has lost his Afterlife. Whomsoever belittles the rulers has lost his worldly affairs. Whomsoever belittles his brothers has lost his honour.”
Siyar A’lām an-Nubalā, 8/408 | Al-Imām adh-Dhahabi [may Allāh have mercy on him]
Translation: Authentic Quotes