Abu Huraira said that fever was mentioned in the presence of God’s messenger, and when a man reviled it the Prophet said, "Do not revile it, for it removes sins as fire removes the dross of iron.”
Thauban reported God’s messenger as saying, "When one of you has an attack of fever the fever is a portion of hell, so he should quench it with water, bathing in a flowing stream facing the direction of the current and saying, ‘In the name of God. O God, heal Thy servant and varify Thy messenger’ after the morning prayer before sunrise. He should dip himself in it three times a day for three days, and if he is not cured in three days, then for five days, and if he is not cured in five days, then for seven, and if he is not cured in seven days, then for nine, for it will hardly last more than nine days by the permission of God who is great and glorious.”
Tirmidhi transmitted it, saying this is a gharib tradition.
He said that God’s messenger said to an invalid whom he visited, "Cheer up, for God most high says, ‘It is my fire to which I give power over my believing servant in the world to be his portion of hell on the day of resurrection.”
Ahmad, Ibn Majah and Baihaqi, in Shu'ab al- iman, transmitted it.
Jabir reported God’s messenger as saying, "When one visits an invalid he continues to plunge into mercy till he sits down, and when he sits down he is immersed in it.”
