Rabbana Atmim Lana Nurana is a beautiful supplication Asking that ask Allah to complete and perfect their light for them, and to forgive their sins.
The Dua is found in The Holy Quran in Surah At-Tahrim, in the Ayat 8th which makes it a special Dua as there is nothing greater than the Words of Allah (S.W.T)
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Rabbana Atmim Lana Nurana in Arabic
The Rabbana Dua is written in Arabic with the Diacritical as:
رَبَّنَآ أَتْمِمْ لَنَا نُورَنَا وَٱغْفِرْ لَنَآ إِنَّكَ عَلَىٰ كُلِّ شَىْءٍۢ قَدِيرٌۭ
and Without the Diacritical as:
ربنا أتمم لنا نورنا واغفر لنا إنك على كل شيء قدير
Transliteration
Rabbana Atmim Lana Nurana Waghfir Lana innaka ‘Ala Kulli Shay’in Qadeer
Rabbana Atmim Lana Nurana Meaning
The meaning of Rabbana Atmim Lana dua is “Our Lord, complete for us our light and forgive us. Indeed, You are over all things capable “
Scholars state that Believers will recite this Dua on the day of judgment when they see the light of the hypocrites being turned off. Because hypocrites only falsely declare their faith without ever truly believing, they live this life and benefit from the light of the Believers without having the light of faith themselves.
This truth will be exposed on the day of judgment, and their false light will abandon them in darkness. That is why true Believers ask Allah to complete and perfect their light for them, and to forgive their sins.
Dua Source
يَـٰٓأَيُّهَا ٱلَّذِينَ ءَامَنُوا۟ تُوبُوٓا۟ إِلَى ٱللَّهِ تَوْبَةًۭ نَّصُوحًا عَسَىٰ رَبُّكُمْ أَن يُكَفِّرَ عَنكُمْ سَيِّـَٔاتِكُمْ وَيُدْخِلَكُمْ جَنَّـٰتٍۢ تَجْرِى مِن تَحْتِهَا ٱلْأَنْهَـٰرُ يَوْمَ لَا يُخْزِى ٱللَّهُ ٱلنَّبِىَّ وَٱلَّذِينَ ءَامَنُوا۟ مَعَهُۥ ۖ نُورُهُمْ يَسْعَىٰ بَيْنَ أَيْدِيهِمْ وَبِأَيْمَـٰنِهِمْ يَقُولُونَ رَبَّنَآ أَتْمِمْ لَنَا نُورَنَا وَٱغْفِرْ لَنَآ ۖ إِنَّكَ عَلَىٰ كُلِّ شَىْءٍۢ قَدِيرٌۭ ٨
O you who have believed, repent to Allāh with sincere repentance. Perhaps1 your Lord will remove from you your misdeeds and admit you into gardens beneath which rivers flow [on] the Day when Allāh will not disgrace the Prophet and those who believed with him. Their light will proceed before them and on their right; they will say, “Our Lord, perfect for us our light and forgive us. Indeed, You are over all things competent.”
Quran [66:8]