The Book of Virtue, Enjoining Good Manners, and Joining of the Ties of Kinship
Ṣaḥīḥ Muslim 6570
لاَ تَسُبِّي الْحُمَّى فَإِنَّهَا تُذْهِبُ خَطَايَا بَنِي آدَمَ كَمَا يُذْهِبُ الْكِيرُ خَبَثَ الْحَدِيدِ
lā tasubbī al-ḥummā fa-innahā tudhhibu khaṭāyā banī ādama kamā yudhhibu al-kīru khabatha al-ḥadīdi
Transliteration generated from the Arabic vowel marks
The full narration
Jabir b. Abdullah reported that Allah's Messenger (ﷺ) visited Umm Sa'ib or Umm Musayyib and said:Umm Sa'ib or Umm Musayyib. why is it that you are shivering? She said:" It is fever and may it not be blessed by Allah, whereupon he (the Holy Prophet) said: Don't curse fever for it expiates the sin of the children of Adam just as furnace removes the alloy of iron
Source
Ṣaḥīḥ Muslim · 6570
Ṣaḥīḥ