رَبَّنَا لاَ تُؤَاخِذْنَا إِن نَّسِينَا أَوْ أَخْطَأْنَا رَبَّنَا وَلاَ تَحْمِلْ عَلَيْنَا إِصْرًا كَمَا حَمَلْتَهُ عَلَى الَّذِينَ مِن قَبْلِنَا رَبَّنَا وَلاَ تُحَمِّلْنَا مَا لاَ طَاقَةَ لَنَا بِهِ وَاعْفُ عَنَّا وَاغْفِرْ لَنَا وَارْحَمْنَآ أَنتَ مَوْلاَنَا فَانصُرْنَا عَلَى الْقَوْمِ الْكَافِرِينَ
Translation 
"Our Lord, do not impose blame upon us if we have forgotten or erred. Our Lord, and lay not upon us a burden like that which You laid upon those before us. Our Lord, and burden us not with that which we have no ability to bear. And pardon us; and forgive us; and have mercy upon us. You are our protector, so give us victory over the disbelieving people."
Transliteration
rabbanaa laa tu’aakhidh-naa in naseenaa aw akhṭa’naa rabbanaa wa laa taḥmil ‛alaynaa iṣran kamaa ḥamaltahu ‛alal-ladheena min qablinaa, rabbanaa wa laa tuḥammilnaa maa laa ṭaaqata lanaa bih, wa‛fu ‛annaa wagh-fir lanaa war-ḥamnaa anta mawlaanaa fan-ṣurnaa ‛alal-qawmil-kaafireen
Sources:
Surah Al-Baqarah (2:286)
