Regarding Moses, Allah says:
رَبِّ إِنِّي ظَلَمْتُ نَفْسِي فَاغْفِرْ لِي
Pronunciation
Rabbi innee zalamtu nafsee faghfir lee.
Meaning
My Lord, indeed I have wronged myself, so forgive me
Source: Surah Al-Qasas 28:16
Duas from IslamicAPI's Masnun Dua dataset (based on the Quran, hadith, Hisnul Muslim and Rahe Belayat). See the dataset