Hadith: All of my Ummah may be forgiven except those who commit sin openly

عَنْ أَبِي هُرَيْرَةَ رضي الله عنه قَالَ: سَمِعْتُ رَسُولَ اللَّهِ صَلَّى اللهُ عَلَيْهِ وَسَلَّمَ يَقُولُ:
«كُلُّ أُمَّتِي مُعَافًى إِلَّا المُجَاهِرِينَ، وَإِنَّ مِنَ المُجَاهَرَةِ أَنْ يَعْمَلَ الرَّجُلُ بِاللَّيْلِ عَمَلًا، ثُمَّ يُصْبِحَ وَقَدْ سَتَرَهُ اللَّهُ عَلَيْهِ، فَيَقُولَ: يَا فُلاَنُ، عَمِلْتُ البَارِحَةَ كَذَا وَكَذَا، وَقَدْ بَاتَ يَسْتُرُهُ رَبُّهُ، وَيُصْبِحُ يَكْشِفُ سِتْرَ اللَّهِ عَنْهُ».
[صحيح] - [متفق عليه] - [صحيح البخاري: 6069]

Abu Hurayrah (may Allah be pleased with him) reported that he heard the Messenger of Allah (may Allah's peace and blessings be upon him) say:
"All of my Ummah may be forgiven except those who commit sin openly. One kind of committing sin openly is when one commits something during the night, then the morning comes and Allah has screened it, but he says: 'O So-and-so, last night, I did such-and-such.' Though he spent the night screened by his Lord (none knowing about his sin), in the morning he removes Allah's screen from himself."
[Authentic hadith] - [Narrated by Bukhari & Muslim] - [Sahih Bukhari - 6069]

Explanation

The Prophet (may Allah's peace and blessings be upon him) clarified that it is hoped for the Muslim sinner to be pardoned and forgiven by Allah except for the one who declares his sin out of boastfulness and rudeness. Such a person does not deserve pardon as he sins at night, then, although Allah conceals his sin, in the morning, he tells others of committing such-and-such sin the night before. He spends his night screened by his Lord, but he removes Allah's screen in the morning and exposes himself.