“Shaykh Muhammad bin Haadee (hafidhahullaah) said:

If you’re asked about one you know has been refuted, but you remain silent, then you have CHEATED the ummah of Muhammad (salallaahu ‘alayhi wa sallam).

Shaykh Saalih al-Fawzaan (hafidhahullaah) said:

Remaining silent about ahlul-bid’a is the greatest ghish (deception) of the Muslims, and is not permissible – @AbdurRahmanOrg – Relayed By Abu Remlah Adam “