Warn Against Those Who Persist Upon Falsehood

Author: Al 'Allaamah Ash Shaikh Zayd Al Madkhalee (rahimahullah) 
Source: Al Ajwibatul Athariyyah pg. 95
Translator: Abu 'Abdis Salaam Siddiq Al Juyaanee

Whoever has made a mistake in 'Aqeedah or in Minhaj -and it had become widespread- should be advised to retract from the error and return to the truth. If he rejects, persists and is obstinate upon his falsehood, then verily it is obligatory that they are warned against by those who have the ability to do so as relates to knowledge, wisdom and in calling (to Allah).