Is it permissible to mention the good deeds of an innovator and not warn against his innovation?
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Question:
The questioner says: If an innovator has good deeds, is it a betrayal of the Muslims to mention his good deeds and not warn against his innovation?
Answer:
You point out the innovation and warn against it. As for his good deeds, Allah knows best about them. Allah knows best whether they are good deeds or not. It is not for you to certify people by saying they have good deeds. Do you know this? Allah knows best. So you point out the innovation so that people may be cautious of it, out of advice. And out of advice, the person who is in error should be made aware. As for the good deeds, Allah knows best about them, and Allah is the One who takes charge of them. Allah does not let good deeds be lost.[An-Nisa 4:40] So you point out the error, and as for the good deeds, leave them to Allah (Glorified and Exalted is He). Allah knows best about them. Yes.
The questioner says: If an innovator has good deeds, is it a betrayal of the Muslims to mention his good deeds and not warn against his innovation?
Answer:
You point out the innovation and warn against it. As for his good deeds, Allah knows best about them. Allah knows best whether they are good deeds or not. It is not for you to certify people by saying they have good deeds. Do you know this? Allah knows best. So you point out the innovation so that people may be cautious of it, out of advice. And out of advice, the person who is in error should be made aware. As for the good deeds, Allah knows best about them, and Allah is the One who takes charge of them. Allah does not let good deeds be lost.
Indeed, Allah does not do injustice, [even] as much as an atom's weight; while if there is a good deed, He multiplies it
إِنَّ اللَّهَ لَا يَظْلِمُ مِثْقَالَ ذَرَّةٍ وَإِن تَكُ حَسَنَةً يُضَاعِفْهَا
Source
قناة «العلامة الدكتور صالح الفوزان»، هل يجوز ذكر حسنات المبتدع وعدم التحذير من بدعته؟ للشيخ الفوزان — youtube.com
The Arabic text is a machine transcription of the audio recording.