Is it permissible for a worshipper to alert someone other than his imam if he makes a mistake in something?
Machine translationRead the Arabic original
Question : Is it permissible for a worshipper to alert someone other than his imam if he makes a mistake in something? For example, if the person next to you moves a lot and distracts you, are you allowed to alert him?
Answer : The answer is yes, he may alert him. Because this is part of correcting his prayer. In fact, even if it is solely to correct his brother's prayer, there is no harm in it.
Answer : The answer is yes, he may alert him. Because this is part of correcting his prayer. In fact, even if it is solely to correct his brother's prayer, there is no harm in it.
Source
قناة «فضيلة الشيخ محمد بن صالح العثيمين»، 1702هل للمصلي أن ينبه غير إمامه إذا أخطأ في شيء📔 الشرح الممتع على زاد المستقنع - ابن عثيمين — youtube.com
The Arabic text is a machine transcription of the audio recording.