once
رَبِّ اغْفِرْ لِي وَلِأَخِي وَأَدْخِلْنَا فِي رَحْمَتِكَ وَأَنتَ أَرْحَمُ الرَّاحِمِينَ
Meaning
«My Lord, forgive me and my brother and admit us into Your mercy, for You are the most merciful of the merciful»
Source and references
7:151The reference is copied from the edition; separate editorial verification is not complete yet.
Source edition: Supplications from the Quran. Open source ↗