أسْتَغْفِرُ اللهَ رَبي مِنْ كُلِ ذَنبٍ وَأتُوبُ إلَيهِ

Transliteration: Astaghfirullah rabbi min kulli zambiyon wa atoobu ilaiyh

Translation: I ask forgiveness of my sins from Allah who is my Lord and I turn towards Him.

Allah sent a message to Prophet Muhammad (ﷺ) in Surah Muhammad ayat 19 and reminded him, “So know, [O Muhammad], that there is no deity except Allah and ask forgiveness for your sin and for the believing men and believing women. And Allah knows of your movement and your resting place.”

And in Hadith 3259 At Tirmidhi “The Messenger of Allah (ﷺ) said: “Indeed I ask Allah for forgiveness seventy times a day.”