أسْتَغْفِرُ اللَّهَ وَ أتُوبُ إلَيْهِ

Astaghfirullaha wa atūūbu ilai(hi)

I seek the Forgiveness of Allah and repent to Him.
[to be reicted 100 times during the day]
[Sahih al Bukhari, Muslim 4:2075]