ENJOINING GOOD AND FORBIDDING EVIL
Amongst the rudimentary issues of reforming society, this forms one of the most integral aspects of social structuring, to denounce evil and observe good and sublime deeds with the aim of radiating goodness within every citizen of the community at large. Hence, a group of Muslims in the community are constrained to observe this religious duty (Fardh e Kifayah). If this duty is abandoned completely then the whole Muslim community will be sinful.
"And there must exist amongst you a group that invites to goodness and bid (others) unto good work and forbid evil, and they are those who have reached their goal." [Surah 3, Verse 104]
The Holy Prophet (pbuh) said: "When people witness the perpetration of evil and do not endeavour to to amend it, Allah will send down His punishment very swiftly." [Ibn Majah]
Hadrat Huzaifah bin Yaman (r.a) narrates that the Holy Prophet (pbuh) said: "I swear by the being in whose control is my life that you must enjoin good and forbid evil or Allah will send down His punishment and then your Duas will not be accepted even if you call unto Him." [Tirmizi]
Those that engage in enjoining the good and forbidding evil should be of mild disposition, well spoken and courteous. Using harsh reprehensible language and disheartening words must be avoided.
"If anyone of you has to enjoin good, let it be executed excellently and superlatively so that speech is impressive and congenial." [Hadith]
Source: 40 Pathways to Jannah