Quran 7:23 from Surah Al-A'raaf on Divine Marvels.
قَالَا رَبَّنَا ظَلَمۡنَآ أَنفُسَنَا وَإِن لَّمۡ تَغۡفِرۡ لَنَا وَتَرۡحَمۡنَا لَنَكُونَنَّ مِنَ ٱلۡخَٰسِرِينَ
English translation: Both of them said Our Lord we have wronged ourselves and if not You forgive [for] us and have mercy (on) us surely we will be among the losers
Transliteration: qala rabbana zalamna anfusana wa-in lam taghfir lana watarhamna lanakunanna mina al-khasirina