The Ibadhi sect is one of the misguided sects
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The fifth question of Fatwa No. ( 6935 ):
Q5: Is the Ibadhi sect considered one of the misguided sects among the sects of the Khawarij , and is it permissible to pray behind them, with evidence?
A5: The Ibadhi sect is one of the misguided sects; because of the rebellion, aggression, and rising up against 'Uthman ibn 'Affan and 'Ali (may Allah be pleased with them both) that is present among them, and it is not permissible to pray behind them. And success is from Allah. And may Allah send prayers and blessings upon our Prophet Muhammad, his family, and his Companions.
Source
www.alifta.gov.sa
The Arabic text is copied verbatim from the original source, without any edits.