رَبِّ اغْفِرْ لِي وَتُبْ عَلَىَّ إِنَّكَ أَنْتَ التَّوَّابُ الرَّحِيْمُ

Rabbighfirli wa tub `alayya innaka Antat-Tawwabur-Rahim

O Allah forgive me and accept my repentance, for You are the Accepter of repentance, the Most Merciful. Narrated by Abdullah ibn Umar (RA): We counted that the Messenger of Allah (ﷺ) would say a hundred times during a meeting: (The dua is mentioned above)

Reference: Sahih. Abu Dawud: 1516