The best Istighfar – Seyyidul Istighfar

اللَّهُمَّ أَنْتَ رَبِّي لا إِلَهَ إِلا أَنْتَ خَلَقْتَنِي وَأَنَا عَبْدُكَ وَأَنَا عَلَى عَهْدِكَ وَوَعْدِكَ مَا اسْتَطَعْتُ أَعُوذُ بِكَ مِنْ شَرِّ مَا صَنَعْتُ أَبُوءُ لَكَ بِنِعْمَتِكَ عَلَيَّ وَأَبُوءُ لَكَ بِذَنْبِي فَاغْفِرْ لِي فَإِنَّهُ لا يَغْفِرُ الذُّنُوبَ إِلا أَنْتَ

Allahumma anta Rabbi la ilaha illa Anta Khalaqtani wa ana abduka, wa ana ‘ala ahdika wa wa’dika mastata’tu, A’udhu bika min Sharri ma sana’tu, abu’u Laka bini’matika ‘alaiya, wa Abu’u Laka bidhanbi faghfirli fainnahu la yaghfiru adhdhunuba illa anta

O Allah! You are my Lord! None has the right to be worshipped but You. You created me and I am Your slave, and I am faithful to my covenant and my promise as much as I can. I seek refuge with You from all the evil I have done. I acknowledge before You all the blessings You have bestowed upon me, and I confess to You all my sins. So I entreat You to forgive my sins, for nobody can forgive sins except You.

[sahih al-Bukhari; 8,75,318, at-Tirmidhi; 3393, an-Nasa’i; 5522, Ahmad; 16662]