عن عائشة رضي الله عنها أن النبي صلى الله عليه وسلم قال: «الحُمَّى من فَيْحِ جهنم فأبردوها بالماء».
The Prophet (may Allah's peace and blessings be upon him) informed us that fever is from the intense heat of Hellfire. So, the heat that the sick person experiences is from it. Therefore, he urged us to overcome such heat by water.
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