Prayer for Repentence and Forgiveness of sins

عَلَى اْلَّذِينَ مِن قَبْلِنَا ج رَبَّنَا وَ لا تُحَمّلْنَا مَا لا طَاقَةَ لَنَابِهِ وَاْعْفُعَنَّا وَ اْغْفِرْلَنَا وَاْرْحَمْنَآ أنتَ مُوْلَنَا فَاْنصُرْنَا عَلَى الْقَوْمِ الْكَفِرِينَ

Rabbana la tu'a-khidhna in-nasina aw akta'na, Rabbana wa la tahmil 'alaiyna isran kama hamaltahu 'alal-ladheena min qablina. Rabbana wala tuham-milna mala taqata-lana beh. Wa'fu-'anna, waghfir-lana war hamna, Anta maulana fansurna 'alal qawmil kaafireen

(Our Lord! Condemn us not if we forget or fall into error; our Lord! Lay not on us a burden like that which Thou didst lay on those before us; Our Lord! lay not on us a burden greater than we have strength to bear. Blot out our sins, and grant us forgiveness. Have mercy on us, Thou art our Protector; Help us against those who stand against Faith)
[surah al-Baqarah; 2:286]