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wa-lā takūnū ka-lladhīna tafarraqū wa-khtalafū min baʿdi mā jāʾahumu l-bayyinātu wa-ʾulāʾika lahum ʿadhābun ʿaẓīmun
Do not be like those who became divided [into sects] and differed after manifest signs had come to them. For such there will be a great punishment
— Ali Quli Qarai
Surah 'Ali-Imran, Verse 105
105 . "And be not like those who separated, and disagreed after clear evidences had come to them; and these are they that will have a grievous chastisement."
We ought to learn lessons from the bitter divergences between schools of the former times:
We should know that the root of separations is not always only the factor of ignorance, because desires also cause discord.
Separation and disagreement not only breaks your power in this present world and finally destroys it, but also brings Fire of Hell to you in the Hereafter.