It is narrated from Sayyiduna Abu Hurayrah (may Allah be pleased with him) that the Prophet (peace and blessings be upon him) said: "Indeed, fever is from the intense heat of Hell, so cool it with water."
Imam al-Tabarani (may Allah have mercy on him) said: "No one narrated this hadith from Qatadah except Sa'id, and no one narrated it from Sa'id except Rawh, and Yahya bin Habib bin Arabi is alone in narrating it."
Hadith Referenceالمعجم الأوسط / باب العين / 3990
Hadith Takhrij«أخرجه ابن ماجه فى «سننه» برقم: 3475»