From Anas bin Malik in a narration ascribed to the Prophet: -sallAllaahu alayhi wa sallam:
“Whoever restrains his anger then Allaah restrains His punishment from him. Whoever restrains his tongue then Allaah hides his mistakes. Whoever apologises to Allaah then Allaah accepts his excuse.”
Silsilah Ahadith As-Saheeha.