From the Why’s and How’s of Fighting Bidʿah
The great scholar, Muḥammad ibn Ṣāliḥ Al-ʿUthaimīn, may Allāh have mercy on him, said:
From being sincere in giving the Messenger ﷺ his rights is that you wage war against the people of innovation in the same way they wage war against the Sunnah. So if they fight [the Sunnah] with speech, then [fight innovation] with speech, and if they fight with action, then [fight] with action.
Muḥammad ibn Ṣāliḥ Al-ʿUthaimīn. Sharḥ Riyāḍh Al-Ṣaliḥīn min Kalām Sayyid Al-Mursalīn. Dār Al-Watan, Riyāḍh: 1425H, vol 2, pg. 390.
N.B.: Title mine (Ed.)
Edited by Mikail ibn Mahboob Ariff