Acts while performing which you are not a believer

Narrated Abu Hurairah Radhiyallahu anhu: that the Messenger of Allah (ﷺ) said: "The adulterer is not a believer while he is committing adultery, and the thief is not a believer while he is stealing, but there is a chance for repentance; (if he repents, Allah will accept the repentance)." Grade : Sahih (Darussalam) Reference : Jami` at-Tirmidhi 2625 In-book reference : Book 40, Hadith 20 English translation : Vol. 5, Book 38, Hadith 2625