Shaykh Saalih al-Fawzaan said, “It is obligatory upon you to explain the truth (to the people of innovation), it is obligatory upon you to explain the truth (to the people of innovation).
If you are sure about the errors that are with them (the people of innovations) and the misguidance(s) that are with them, sure one-hundred percent and you have the ability, you have knowledge by which you are able to clarify, then this is obligatory upon you, “And when Allaah took the covenant from those who were given the Book that you will explain, clarify it to the people and not conceal it” [and] “Verily, those who conceal what we have revealed of clear evidences and guidance”, it is not permissible to conceal knowledge.
If you have knowledge with you and you are certain about the misguidance(s) of certain factions (of the people of innovation), then explain them to the people so that they may beware of them, and this is from sincere advice.
He (sallallaahu alayhi wasallam) said, “The religion comprises sincerity of purpose” and we (the Companions) said, “To whom?” and he said, “To Allaah, His Book, His Messenger, the leaders of the Muslims and the common folk” (Reported by Muslim, no. 55).
Do not fear the people, upon you is to fear Allaah, the Sublime and Exalted, and explain to the people, refute falsehoood, and do not fear the people…”
Posted by Abdul Kareem Ibn Ozzie