Prophet Moses (PBUH) knew that he was driven by anger, so he said: ( رَبِّ اغْفِرْ لِي وَلِأَخِي) (“My Lord, forgive me and my brother).
([Moses] said, “My Lord, forgive): He invoked Allah (swt) to forgive his sin.
(me and my brother): He included his brother with him (PBUT) in the prayer.
( وَأَدْخِلْنَا فِي رَحْمَتِكَ ) (and admit us into Your mercy): He not only asked for Allah’s (swt) Forgiveness, but to also bestow His (swt) Mercy and endless Blessings upon them.
( وَأَنتَ أَرْحَمُ الرَّاحِمِينَ ) (for You are the most merciful of the merciful): Allah (swt) spreads mercy among mankind so that a person is merciful towards his children; indeed, Allah (swt) is the Most Merciful.