What is prescribed for the ma'mum (those praying behind the imam) when praising Allah in the du'a' of qunut?
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Question : He says: When praising Allah (Mighty and Majestic) in the du'a' of qunut, what is prescribed for the ma'mum? May Allah reward you with good.
Answer : It appears that it is prescribed to say tasbih, for example, "Subhanahu" (Glory be to Him) or "Jalla wa 'Ala" (Exalted and Majestic is He), or something similar. I have not heard anything specific regarding this, but this is like the hadith of Hudhayfah: "No one passes by the tasbih without saying it."
Answer : It appears that it is prescribed to say tasbih, for example, "Subhanahu" (Glory be to Him) or "Jalla wa 'Ala" (Exalted and Majestic is He), or something similar. I have not heard anything specific regarding this, but this is like the hadith of Hudhayfah: "No one passes by the tasbih without saying it."
Source
قناة «فضيلة الشيخ محمد بن صالح العثيمين»، 690 - 4600 ماذا يشرع في حق المأمومين عند الثناء على الله في دعاء القنوت؟ ابن عثيمين — youtube.com
The Arabic text is a machine transcription of the audio recording.