Astaghfirullāha wa atūbu ilayh. I seek the forgiveness of Allah and repent to Him. (Recite one hundred times in Arabic during the day.) Reference: Al-Bukhari, cf. Al-Asqalani, Fathul-Bari 11/101, Muslim 4/2075.

أَسْتَغْفِرُ اللَّهَ وَأَتُوبُ إِلَيْهِ (مِائَةَ مَرَّةٍ فِي الْيَوْمِ)