رَبِّ ٱغۡفِرۡ لِي وَلِأَخِي وَأَدۡخِلۡنَا فِي رَحۡمَتِكَۖ وَأَنتَ أَرۡحَمُ ٱلرَّـٰحِمِينَ.
My Lord, forgive me and my brother and admit us into Your mercy, for You are the most merciful of the merciful.
Rabbi ghfir li waliakhi waadkhilna fi rahmatika waanta arhamu rrahimin
Prophet Musa asks Allah to admit him and his brother, Harun, into His mercy. This is different than simply asking Allah to have mercy upon them. To admit them into his mercy is to allow His mercy to encompass them from all sides so that it protects them completely. -Tafseer As-Sa’di.