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

عن أبي هريرة رضي الله عنه قال: سمعت رسول الله صلى الله عليه وسلم يقول: «كل أُمتي مُعَافًى إلا المُجاهرين، وإنَّ من المُجَاهرة أن يعملَ الرجلُ بالليل عملًا، ثم يُصْبِح وقد سَتره الله عليه، فيقول: يا فلان، عَمِلت البَارحة كذا وكذا، وقد بَات يَسْتُره ربه، ويُصبح يَكشف سِتْرَ الله عنه».
[صحيح] - [متفق عليه]

Abu Hurayrah (may Allah be pleased with him) reported that the Prophet (may Allah's peace and blessings be upon him) said: "c2">“All of my Ummah may be forgiven except those who commit sin openly. One kind of committing sin openly is that someone sins during the night, then the morning comes and Allah has screened his sin (from people), but he says: ‘O So and so, last night, I did such and such.’ His Lord has screened his sin all night but in the morning he exposes what Allah has screened.”
Sahih/Authentic. - [Al-Bukhari and Muslim]

Explanation

Allah, the Almighty, will pardon all Muslims except the one who exposes himself by committing sins at night, and, though Allah screens his sin, he wakes up in the morning and tells the people what he has done. Allah concealed his affair but he himself exposed it.