12. Powerful Dua for Forgiveness of Major Sin
أَسْتَغْفِرُ اللَّهَ الْعَظِيمَ الَّذِي لَا إِلَهَ إِلَّا هُوَ الْحَىُّ الْقَيُّوْمُ وَأَتُوبُ إِلَيْهِ
اَسْتَغْفِرُ اللّٰهَ الْعَظِيْمَ الَّذِيْ لَا اِلٰهَ اِلَّا هُوَ الْحَىُّ الْقَيُّوْمُ وَاَتُوْبُ اِلَيْهِ
Astaghfirullaa hal-'Adheemal-ladhee laa 'ilaaha 'illaa Huwal-Hayyul-Qayyoomu wa 'atoobu 'ilayhi
Translation
I seek the forgiveness of Allah the Mighty, Whom there is none worthy of worship except Him, the Living, the Eternal, and I repent to Him.
The Prophet (ﷺ) said, "Whoever says, 'I seek forgiveness from Allah, the Exalted, there is no god but He, the Ever-Living, the Everlasting, and I repent to Him', is forgiven even if he flees from the battlefield."