´It was narrated that Abu Hurairah said:` “Mention of fever was made in the presence of the Messenger of Allah (ﷺ), and a man cursed it. The Prophet (ﷺ) said: ‘Do not curse it, for it erases sin as fire removes filth from iron.’”
Hadith ReferenceSunan Ibn Majah / Chapters on Medicine / Hadith: 3469