Shaykh Bin Baz said, “If the people of the truth remained silent about clarifying it, then certainly those upon error (sin, innovation, shirk and disbelieve) would continue upon their errors, and others would follow them in error.
Those who are silent will have drawn on themselves the sin of concealment about which Allah threatened them (in a statement in the Quran).
Allah said, “Indeed, those who conceal what We sent down of clear proofs and guidance after We made it clear for the people in the Scripture – those are cursed by Allah and cursed by those who curse, except for those who repent and correct themselves and make evident [what they concealed]. Those – I will accept their repentance, and I am the Accepting of repentance, the Merciful.” [Surah al-Baqarah (2):159-160]
Indeed, Allah took a covenant with the scholars from the People of the Book to clarify the book for the people and not to conceal it, and he blamed them for throwing it behind their backs, and he warned us from following them. So, if Ahlus-Sunnah remained quiet about clarifying the mistakes of those who oppose the Quran and Sunnah, they have resembled the People of the Book whom Allah is angry with and those who are astray.”
Ref: Abdul-‘Aziz b. Baz, Majmu al-Fatawa, v.3/pg. 72 via embodyislam.org
Posted By Abdul Kareem Ibn Ozzie