Question: Is Al-Ibaadiyyah regarded as one of the deviant sects of Al-Khawaarij, and is it permissible to pray behind them?
Answer: Al-Ibadiyyah is one of the deviant sects because of their aggression and rebellion against
Uthman ibnAffaan and `Alee (may Allaah be pleased with them both), and it is not permissible to pray behind them.… read more here.
Question: What is the meaning of the Hadeeth of the Messenger of Allaah (peace and blessings of Allaah be upon him) During the last days, some young foolish people who will say the best words will appear. Their faith will not go beyond their throats (i.e. they will have no faith) and will go out from (leave) Islaam as an arrow when launched from a bow. So, wherever you find them, kill them, for whoever kills them shall be rewarded on the Day of Resurrection.
Who is meant by this Hadeeth? Which time is the Messenger (peace be upon him) referring to in this Hadeeth?
Answer: In this Hadeeth, the Prophet (peace and blessings of Allaah be upon him) refers to the Al-Khawaarij. This is because they go to extremes in religion and declare Muslims to be disbelievers because of the sins they commit, which do not nullify faith… read more here.