Praying on a raised area such as a bed
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Question: Is it permissible to perform the prayer on an area/place raised from the ground such as a bed or the like if a person had doubt about the purity (cleanliness) of the ground and there was no (Sharee'ah-based) excuse such as illness or the like (preventing him from praying directly on the ground)?

Response: There is no harm in a person praying on a raised area/place such as a bed or the like so long as it was pure (clean) and he was sure he would not experience any rocking/swaying or any interference in the prayer.

Shaykh Saailh ibn Fowzaan
al-Muntaqaa min Fataawa Shaykh Saalih al-Fowzaan - Volume 5, Page 36, Fatwa No.48