Abu Sa'id and abu Hurairah reported that they heard Allah's Messenger (ﷺ) as saying: Never a believer is stricken with discomfort, hardship or illness, grief or even with mental worry that his sins are not expiated for him.
Hadith ReferenceSahih Muslim / The Book of Virtue, Enjoining Good Manners, and Joining of the Ties of Kinship / Hadith: 2573