رَبِّ إِنِّي ظَلَمْتُ نَفْسِي فَاغْفِرْ لِي.

My Lord, indeed I have wronged myself, so forgive me.

Rabbi inni dhalamtu nafsi faghfirli.

Prophet Musa spoke these words immediately after accidentally killing the Coptic man who was fighting with a man from the Children of Israel. Hence, he wasted no time seeking Allah’s forgiveness, and so, on account of his genuine regret, Allah forgave him for what he had done. -Tafseer As-Sa’di and others.