رَبَّنَا آمَنَّا فَاغْفِرْ لَنَا وَارْحَمْنَا وَأَنتَ خَيْرُ الرَّاحِمِينَ

Rabbana amanna faghfir lana warhamna wa anta khairur Rahimiin

Word By Word:

Rabbana: Our Lord

amanna: we believe

faghfir: so forgive 

lana: us

warhamna: and have mercy on us

wa: and 

anta: YOU

khairu: best

Ar Rahimeen: those who show mercy

Translation: Our Lord! We believe; then do Thou forgive us, and have mercy upon us: For Thou art the Best of those who show mercy [23: 109]

Tafseer: This is a dua made by a group of Muslims. They used tocontinuously make this dua. In this dua the believers are addressing Allah by saying, "O Allah! We have brought Imaan, hence forgive us and have mercy on us"