رَبِّ اغْفِرْ لِي وَتُبْ عَلَيَّ إِنَّكَ أَنْتَ التَّوَّابُ الرَّحِيمُ
Rabbigh-fir li wa tub 'alayya innaka antat-Tawwabur-Rahim
Mein Herr, vergib mir und nimm meine Reue an. Du bist wahrlich der Reue-Annehmende, der Barmherzige.
Recite frequently - the Prophet said this 100 times in one sitting
Ibn Umar (RA) said: 'We used to count the Prophet (PBUH) saying this 100 times in one gathering.'