It is narrated from Sayyiduna Anas bin Malik (may Allah be pleased with him) that the Prophet (peace and blessings be upon him) said: "When one of you has a fever, let him sprinkle cold water (over his body) at the time of suhur (before dawn) for three nights." This hadith is sahih (authentic) on the condition of Muslim, but the two Shaykhs (Bukhari and Muslim) did not record it; however, both of them agreed upon the chains in which it is stated that "Fever is from the intense heat of Hell, so cool it with water."

It is narrated from Abu Jamrah al-Dubai; he said: I used to sit in the gathering of Sayyiduna Ibn Abbas (may Allah be pleased with them both) in Makkah. Then I was absent for a few days, and when I came back he asked: What kept you away? I said: I had a fever. He said: Cool it with the water of Zamzam, for the Messenger of Allah (peace and blessings be upon him) said: "Fever is from the intense heat of Hell, so cool it with the water of Zamzam." This hadith is sahih (authentic) on the condition of the two Shaykhs (Bukhari and Muslim), but they did not record it with this wording.