The Holy Quran 3:104 — Surah Ali 'Imran
Arabic text
وَلْتَكُن مِّنكُمْ أُمَّةٌ يَدْعُونَ إِلَى ٱلْخَيْرِ وَيَأْمُرُونَ بِٱلْمَعْرُوفِ وَيَنْهَوْنَ عَنِ ٱلْمُنكَرِ ۚ وَأُو۟لَـٰٓئِكَ هُمُ ٱلْمُفْلِحُونَ
Translation
There should be a group from you (the Ulema and those adequately trained for this purpose) who invite towards (all that is) good, command (others to do) what is right (as accepted by all) and forbid (others from) evil (as perceived by all). These (people who do this) are indeed the successful ones (those who have reached their goal). (The good and evil mentioned in this verse refer to what the Shari'ah defines as good and evil.)
Tafsir (excerpt) — Tafsir Usmani
The need for a body of ulama (scholars of religion): that is, taqwa (mindfulness of Allah), holding fast to the rope of Allah, unity and concord in the life of the community, Islamic brotherhood: all these can endure only so long as there remains among the Muslims a body devoted specially to calling and guiding.
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