The Holy Quran 6:159 — Surah Al-An'am
Arabic text
إِنَّ ٱلَّذِينَ فَرَّقُوا۟ دِينَهُمْ وَكَانُوا۟ شِيَعًا لَّسْتَ مِنْهُمْ فِى شَىْءٍ ۚ إِنَّمَآ أَمْرُهُمْ إِلَى ٱللَّهِ ثُمَّ يُنَبِّئُهُم بِمَا كَانُوا۟ يَفْعَلُونَ
Translation
Indeed you (O Muhammad ﷺ) have nothing to do with those (Jews and Christians) who caused divisions (sects) in their religion (by accepting parts of it and rejecting parts) and have split into groups (denominations. Therefore, do not worry too much about them). Their matter rests with Allaah. Thereafter (in the Aakhirah) He will inform them of what (evil) they used to do (and punish them accordingly).
Tafsir (excerpt) — Tafsir Usmani
Sectarianism in religion: in the previous ruku' (section), after many commands were set out with the words قُلْ تَعَالَوْا اَتْلُ مَا حَرَّمَ رَبُّكُمْ عَلَيْكُمْ “Say: Come, I shall recite to you what your Lord has forbidden for you” and so on, it was said: وَاَنَّ هٰذَا صِرَاطِيْ مُسْتَقِيْمًا فَاتَّبِعُوْهُ وَلَا تَتَّبِعُوا السُّبُلَ فَتَفَرَّقَ بِكُمْ…
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