Quran 7:149 from Surah Al-A'raaf on Divine Marvels.
وَلَمَّا سُقِطَ فِيٓ أَيۡدِيهِمۡ وَرَأَوۡاْ أَنَّهُمۡ قَدۡ ضَلُّواْ قَالُواْ لَئِن لَّمۡ يَرۡحَمۡنَا رَبُّنَا وَيَغۡفِرۡ لَنَا لَنَكُونَنَّ مِنَ ٱلۡخَٰسِرِينَ
English translation: And when (it was made to) fall into their hands and they saw that they (had) indeed gone astray they said If not has Mercy on us Our Lord and forgive [for] us we will surely be among the losers
Transliteration: walamma suqita fi aydihim wara-aw annahum qad dallu qalu la-in lam yarhamna rabbuna wayaghfir lana lanakunanna mina al-khasirina