Ishaaq al-Fazaaree – a man of Sunnah – was the one who disciplined the people of ath-Thughar and taught them the Sunnah. And if an innovator entered ath-Thughar, he would oust him [to protect the people of ath-Thughar from his innovation].
He who follows his desires is prohibited from guidance, and falls into opposing the Sharee’ah, and [as a result] is a cause of splitting the jamaa’ah.
The signs of the people of innovation are clear and obvious. The most apparent of their signs is their severe enmity for those who carry the reports of the Prophet.
Whoever listens to a person of innovation – and knows that he is a person of innovation – then protection is taken away from him, and he is left to himself.
Whoever listens to an innovator has left the protection of Allaah and is entrusted with the innovation.