There is no god worthy of worship except You. You are free from imperfection. Indeed, I have been of the wrongdoers. (21:87)
My Lord, I have certainly wronged myself, so forgive me. (28:16)
Our Lord, we have wronged ourselves. If You do not forgive us and have mercy upon us, we will surely be amongst the losers. (7:23)
You are our Protector, so forgive us and have mercy upon us. You are the best of those who forgive. (7:155)
O Allah, forgive my mistakes, ignorance, transgression in my matters, and what You are more Knowledgeable of than me. O Allah, forgive me for what I did in earnestness and in jest; unintentionally or intentionally; as I have committed all of these (types of sins). O Allah, forgive me for what I have already done, what I am yet to do, what I did publicly, what I did privately, and what You are more Knowledgeable of than me. You are the One who brings forward and You are the One who defers. You are All-Powerful over everything.
Abū Mūsā al-‘Ashʿarī (raḍiy Allāhu ‘anhu) reported from his father that the Messenger of Allah ﷺ would supplicate with [the above]. (Muslim 2719)