From Sahih Bukhari (Hadith 2641):
Narrated `Umar bin Al-Khattab:People were (sometimes) judged by the revealing of a Divine Inspiration during the lifetime of Allah's Apostle but now there is no longer any more (new revelation). Now we judge you by the deeds you practice publicly, so we will trust and favor the one who does good deeds in front of us, and we will not call him to account about what he is really doing in secret, for Allah will judge him for that; but we will not trust or believe the one who presents to us with an evil deed even if he claims that his intentions were good
Reference: Bukhari 2641