أَسْتَغْفِرُ اللَّهَ وَأَتُوبُ إِلَيْهِ
Astaghfirullaha wa atubu ilayh
I seek Allah's forgiveness and I repent to Him. (The Prophet ﷺ used to say this more than 100 times a day.)
Al-Agharr al-Muzani (RA) narrated that the Prophet ﷺ used to seek Allah's forgiveness more than 100 times in a single day. Despite being forgiven all his past and future sins, he ﷺ maintained this practice out of gratitude and humility.
Related Du'as
رَبِّ إِنِّي ظَلَمْتُ نَفْسِي فَاغْفِرْ لِي
My Lord, indeed I have wronged myself, so forgive me.
Sahihلَا إِلَٰهَ إِلَّا أَنتَ سُبْحَانَكَ إِنِّي كُنتُ مِنَ الظَّالِمِينَ
There is no deity except You; exalted are You. Indeed, I have been of the wrongdoers.
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.
Sahihاللَّهُمَّ إِنَّكَ عَفُوٌّ كَرِيمٌ تُحِبُّ الْعَفْوَ فَاعْفُ عَنِّي
O Allah, You are the Pardoner, the Most Generous, and You love to pardon, so pardon me.
Sahih