Sahih Muslim Book 42, Hadith Number 7124.

Chapter : It is forbidden to publicise one’s sins.

Abu Huraira reported Allah’s Messenger (may peace be upon him) as saying: All the people of my Ummah would get pardon for their sins except those who publicise them. And (it means) that a servant should do a deed during the night and tell the people in the morning that he has done so and so, whereas Allah has concealed it. And he does a deed during the day and when it is night he tells the people, whereas Allah has concealed it. Zuhair has used the word hijar for publicising.