رَبَّنَا ظَلَمْنَا أَنْفُسَنَا وَإِنْ لَمْ تَغْفِرْ لَنَا وَتَرْحَمْنَا لَنَكُونَنَّ مِنَ الْخَاسِرِينَ
Purpose Ask Allah for forgiveness and mercy.
When to Use Read this when repenting and asking for Allah's mercy.
Source Quran 7:23

Transliteration

Rabbana zalamna anfusana wa in lam taghfir lana wa tarhamna lanakunanna minal-khasirin.

Meaning

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.