Hadith #18 (The Forty Hadith of Imam Nawawi)
Book: Fear Allah, follow bad deeds with good deeds, good character
Narrator(s): Abu Dharr Jundub ibn Junadah and Muadh ibn Jabal
Grade: Hasan

Have taqwa (fear) of Allah wherever you may be, and follow up a bad deed with a good deed which will wipe it out, and behave well towards the people.

Source: https://parallelquran.com/hadith/forty-nawawi-18/