It is narrated from Hazrat Thawban (may Allah be pleased with him) that the Noble Prophet (peace and blessings be upon him) said: When any of you gets a fever—which is a part of the fire—he should extinguish it with cold water. He should stand facing the direction of the flow in front of a running stream and say: "BISMILLAH ALLAHUMMA I FI ABDIKA WA SADIQ RASULAKA" (In the name of Allah! O Allah, grant Your servant healing and prove Your Messenger true). This should be done before sunrise and after the Fajr prayer. After that, he should immerse himself in the running stream three times, and do this for three days. If he is not cured in three days, then for five days, otherwise for seven, otherwise for nine days. He should not exceed nine days; inshaAllah (he will be cured).