Ibn AAumar (R) said: It would be counted that the Messenger of Allah (SAWS) would say one hundred times at any one sitting before getting up:
رَبِّ اغْفِـرْ لي، وَتُبْ عَلَـيَّ، إِنَّكَ أَنْـتَ التَّـوّابُ الغَـفور.
Rabbigh-fir lee watub AAalay, innaka antat-tawwabul-ghafoor.
‘O my Lord, forgive me and turn towards me (to accept my repentance). Verily You are The Oft-Returning. The Oft-Forgiving.’