رَبِّ إِنِّي ظَلَمْتُ نَفْسِي فَاغْفِرْ لِي
Rabbi inni dhalamtu nafsi faghfir li
My Lord, indeed I have wronged myself, so forgive me.
Musa (AS) said this after accidentally killing a man. He had just committed the gravest mistake of his life — yet his immediate instinct was to turn to Allah, not to run. And Allah forgave him on the spot: "So He forgave him. Indeed, He is the Forgiving, the Merciful" (28:16). No penance, no waiting period. Sincere acknowledgment was enough.
Related Du'as
رَبَّنَا إِنَّنَا آمَنَّا فَاغْفِرْ لَنَا ذُنُوبَنَا وَقِنَا عَذَابَ النَّارِ
Our Lord, indeed we have believed, so forgive us our sins and protect us from the punishment of the Fire.
Sahihرَبَّنَا فَاغْفِرْ لَنَا ذُنُوبَنَا وَكَفِّرْ عَنَّا سَيِّئَاتِنَا وَتَوَفَّنَا مَعَ الْأَبْرَارِ
Our Lord, forgive us our sins and expiate our misdeeds, and cause us to die with the righteous.
Sahihرَبِّ اغْفِرْ لِي وَتُبْ عَلَيَّ إِنَّكَ أَنْتَ التَّوَّابُ الرَّحِيمُ
My Lord, forgive me and accept my repentance. Indeed, You are the Acceptor of Repentance, the Most Merciful.
Sahihرَبَّنَا ظَلَمْنَا أَنفُسَنَا وَإِن لَّمْ تَغْفِرْ لَنَا وَتَرْحَمْنَا لَنَكُونَنَّ مِنَ الْخَاسِرِينَ
Our Lord, we have wronged ourselves, and if You do not forgive us and have mercy upon us, we will surely be among the losers.
Sahih