I saw a man praying a voluntary prayer during a time when prayer is prohibited. Is it obligatory for me to inform him after he has started the prayer?
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Question:
Honorable Shaykh, may Allah grant you success. He says: If I see someone praying a voluntary prayer during the times of prohibition, is it obligatory for me to inform him after he has started the prayer, or should I leave him alone?
Answer:
The greeting of the mosque; there is scholarly disagreement regarding the greeting of the mosque, so do not forbid him from it. However, if it is a voluntary prayer other than the greeting of the mosque, you clarify to him that it is not permissible to pray after the 'Asr prayer until the sun sets. Yes, you clarify this to him? Yes.
Honorable Shaykh, may Allah grant you success. He says: If I see someone praying a voluntary prayer during the times of prohibition, is it obligatory for me to inform him after he has started the prayer, or should I leave him alone?
Answer:
The greeting of the mosque; there is scholarly disagreement regarding the greeting of the mosque, so do not forbid him from it. However, if it is a voluntary prayer other than the greeting of the mosque, you clarify to him that it is not permissible to pray after the 'Asr prayer until the sun sets. Yes, you clarify this to him? Yes.
Source
قناة «العلامة الدكتور صالح الفوزان»، [2271 -3022] رأيت رجلا يصلي صلاة نافلة في وقت نهي فهل يجب علي أن أبلغه بعدما شرع في الصلاة؟ — youtube.com
The Arabic text is a machine transcription of the audio recording.