Hisnul Muslim 195

At a sitting or gathering

رَبِّ اغْفِرْ لِي وَتُبْ عَلَيَّ إِنَّكَ أَنْتَ التَّوَّابُ الْغَفُورُ

Rabbighfir lee wa tub 'alayya 'innaka 'Antat-Tawwaabul-Ghafoor.

My Lord, forgive me and accept my repentance, You are the Ever-Relenting, the All-Forgiving.