Ibn Taymiyyah stated:

The very first [heretical] innovations such as the innovation of the Khārijites arose due to their poor understanding of the Qurʾān. They did not intend to oppose it, but they understood from it what it did not indicate. They thought that it obligates the expulsion of the sinners from Islām, since a believer [in their faulty understanding] can only be the one who is righteous and pious.

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