رَبِّ اغْفِرْ لِي وَتُبْ عَلَيَّ إِنَّكَ أَنْتَ التَّوَّابُ الْغَفُورُ
“O Allāh, forgive me and accept my repentance, verily You are at-Tawwāb (One who accepts repentance) al-Ghafūr (all-Forgiving).” (100 times after Ṣalāh)
[Narrated by Ibn ‘Umar; Collected by at-Tirmidhī; authenticated by Albāni]