If the imam prays while lying down, why does the ma'mum not pray while standing?
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Question : The imam prayed while lying down, why do we not say that they pray on the ground?
Answer : Yes, because the 'illah (operative cause) for which the Prophet (peace and blessings be upon him) prohibited standing is present, which is that they stand over him, just as the non-Arabs stand over their kings.
Answer : Yes, because the 'illah (operative cause) for which the Prophet (peace and blessings be upon him) prohibited standing is present, which is that they stand over him, just as the non-Arabs stand over their kings.
Source
قناة «فضيلة الشيخ محمد بن صالح العثيمين»، 3202إذا صلى الإمام مضطجعًا لماذا لا يصلي المأموم قيامًا؟📔 الشرح الممتع على زاد المستقنع - ابن عثيمين — youtube.com
The Arabic text is a machine transcription of the audio recording.