Narrated by Abu Huraira (Radi-Allahu 'anhu):
I heard Allah's Apostle (Sallallahu 'Alaihi Wa
Sallam) saying. "All the sins of my followers
will be forgiven except those of the Mujahirin
(those who commit a sin openly or disclose
their sins to the people). An example of such
disclosure is that a person commits a sin at
night and though Allah screens it from the
public, then he comes in the morning, and
says, 'O so-and-so, I did such-and-such (evil)
deed yesterday,' though he spent his night
screened by his Lord (none knowing about
his sin) and in the morning he removes
Allah's screen from himself."
Bukhari Vol. 8 : No. 95