In The Name of Allah, The Most Merciful, The Bestower of Mercy.

If a scholar – a criticiser- refutes a person who deserves to be refuted and warns against him due to his bidah, he [this refute, criticiser, scholar] is from the people of justice – those who are sincere to the religion of Islam and the Muslims, and he is not an oppressor; rather, he is a person who has fulfilled an obligation. If he keeps quiet about someone who deserves to be refuted and warned against, he is one (guilty of) betrayal. If he remains silent to the extent that he defends and shelters bidah and its people, then indeed he has destroyed himself, dragged those who listen to him into a mess, active in aiding falsehood and rejecting truth.

Al-Mahajjah Al-Baydaa Fee Himaayah As-Sunnah Al-Gharraa Min Zallaat Ahl Al-Akhtaa Wa- Zaighi Ahl Al-Ahwaa’ page 31