Our Lord, Perfect for us our Light and Forgive us. Surely, You have Power over all Things.

A supplication seeking the perfection of one’s light (guidance and righteousness) and asking for Allah’s forgiveness.

رَبَّنَا أَتْمِمْ لَنَا نُورَنَا وَاغْفِرْ لَنَا إِنَّكَ عَلَى كُلِّ شَيْءٍ قَدِيرٌ

Our Lord, perfect for us our light and forgive us. Surely, You have power over all things.

Rabbanā atmim lanā nūranā waghfir lanā innaka ʿalā kulli shayʾin qadīr.

Context

When seeking perfection in guidance, righteousness, and asking for forgiveness. To ask Allah for the perfection of guidance, righteousness, and His forgiveness.
This supplication will be made by believers on the Day of Judgement

Benefits

This duʿā is a plea to Allah to perfect the believer's guidance and righteousness, symbolized by light. It emphasizes the importance of seeking Allah's forgiveness and acknowledges His supreme power and competence.

Source