195
رَبِّ اغْفِرْ لِي، وَتُبْ عَلَيَّ، إِنَّكَ أَنْتَ التَّوَّابُ الْغَفُورُ
Rabbighfir li, watub 'alayya, innaka antat-tawwabul-ghafur
My Lord, forgive me and accept my repentance; truly You are the Accepter of repentance, the Oft-Forgiving.
Ibn ʿUmar said that the Prophet ﷺ would be counted saying this a hundred times in a single sitting before he rose.
Source Jāmiʿ at-Tirmidhī 3434 Ṣaḥīḥ
Compiler cites at-Tirmidhī and others (at-Tirmidhī's wording); see al-Albānī, Ṣaḥīḥ at-Tirmidhī 3/153, Ṣaḥīḥ Ibn Mājah 2/321