Hadith: A servant committed a sin and said: 'O Allah, forgive my sin

عن أبي هريرة رضي الله عنه
عَنِ النَّبِيِّ صَلَّى اللهُ عَلَيْهِ وَسَلَّمَ، فِيمَا يَحْكِي عَنْ رَبِّهِ عَزَّ وَجَلَّ، قَالَ: «أَذْنَبَ عَبْدٌ ذَنْبًا، فَقَالَ: اللَّهُمَّ اغْفِرْ لِي ذَنْبِي، فَقَالَ تَبَارَكَ وَتَعَالَى: أَذْنَبَ عَبْدِي ذَنْبًا، فَعَلِمَ أَنَّ لَهُ رَبًّا يَغْفِرُ الذَّنْبَ، وَيَأْخُذُ بِالذَّنْبِ، ثُمَّ عَادَ فَأَذْنَبَ، فَقَالَ: أَيْ رَبِّ اغْفِرْ لِي ذَنْبِي، فَقَالَ تَبَارَكَ وَتَعَالَى: عَبْدِي أَذْنَبَ ذَنْبًا، فَعَلِمَ أَنَّ لَهُ رَبًّا يَغْفِرُ الذَّنْبَ، وَيَأْخُذُ بِالذَّنْبِ، ثُمَّ عَادَ فَأَذْنَبَ، فَقَالَ: أَيْ رَبِّ اغْفِرْ لِي ذَنْبِي، فَقَالَ تَبَارَكَ وَتَعَالَى: أَذْنَبَ عَبْدِي ذَنْبًا، فَعَلِمَ أَنَّ لَهُ رَبًّا يَغْفِرُ الذَّنْبَ، وَيَأْخُذُ بِالذَّنْبِ، اعْمَلْ مَا شِئْتَ فَقَدْ غَفَرْتُ لَكَ».
[صحيح] - [متفق عليه] - [صحيح مسلم: 2758]

Abu Hurayrah (may Allah be pleased with him) reported:
The Prophet (may Allah's peace and blessings be upon him), narrating from his Almighty Lord, said: "A servant committed a sin and said: 'O Allah, forgive my sin,’ and Allah Almighty said: ‘My servant committed a sin and then realized that he has a Lord Who forgives sins and punishes for sins.' Then, he committed a sin again and said: ‘My Lord, forgive my sin,’ and Allah Almighty said: ‘My servant committed a sin and then realized that he has a Lord Who forgives sins and punishes for sins.’ He again committed a sin and said: ‘My Lord, forgive my sin,’ and Allah Almighty said: ‘My servant committed a sin and then realized that he has a Lord Who forgives sins and punishes for sins. Do whatever you wish, for I have forgiven you.'"
[Authentic hadith] - [Narrated by Bukhari & Muslim] - [Sahih Muslim - 2758]

Explanation

The Prophet (may Allah's peace and blessings be upon him) narrates from his Lord that if a servant commits a sin and then says, "O Allah, forgive my sin", Allah Almighty says: My servant committed a sin and then realized that he has a Lord Who forgives sins, covers him and pardons him, or punishes for sins. I have forgiven him. Then, the servant again commits a sin and says, "O Allah, forgive my sin", and Allah says: My servant committed a sin and then realized that he has a Lord Who forgives sins, covers him and pardons him, or punishes for sins. I have forgiven My servant. Then, again, the servant commits a sin and says, "O Allah, forgive my sin", and Allah says: My servant committed a sin and then realises that he has a Lord Who forgives sins, covers him and pardons him, or punishes for sins. I have forgiven My servant. Let him do whatever he wishes, as long as he gives it up every time he sins, feels regretful, and determines not to do it again; yet, his self overcomes him, and he falls into the sin again and again. So, as long as he acts like this, sinning and repenting, I will forgive him. Indeed, repentance abolishes what is before it.