Allah says:

رَبَّنَا ظَلَمْنَا أَنفُسَنَا وَإِن لَّمْ تَغْفِرْ لَنَا وَتَرْحَمْنَا لَنَكُونَنَّ مِنَ الْخَاسِرِينَ

Rabbanaa zalamnaaa anfusanaa wa il-lam taghfir lanaa wa tarhamnaa lanakoonanna minal-khaasireen.

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.

Reference: Surah Al-A'raf 7:23