The Prophet (ﷺ) used to recite more than seventy times a day:
أَسْتَغْفِرُ اللَّهَ وَأَتُوْبُ إِلَيْهِ
Pronunciation
astaghfir-ullaaha wa atuwb 'iilayhi
Meaning
I seek forgiveness of God and repent to him.
Source: Bukhari: 6307
Read the hadith
حَدَّثَنَا أَبُو الْيَمَانِ، أَخْبَرَنَا شُعَيْبٌ، عَنِ الزُّهْرِيِّ، قَالَ أَخْبَرَنِي أَبُو سَلَمَةَ بْنُ عَبْدِ الرَّحْمَنِ، قَالَ قَالَ أَبُو هُرَيْرَةَ سَمِعْتُ رَسُولَ اللَّهِ صلى الله عليه وسلم يَقُولُ " وَاللَّهِ إِنِّي لأَسْتَغْفِرُ اللَّهَ وَأَتُوبُ إِلَيْهِ فِي الْيَوْمِ أَكْثَرَ مِنْ سَبْعِينَ مَرَّةً " .
Narrated Abu Huraira: I heard Allah's Messenger (ﷺ) saying." By Allah! I ask for forgiveness from Allah and turn to Him in repentance more than seventy times a day." [Bukhari: 6307]
Duas from IslamicAPI's Masnun Dua dataset (based on the Quran, hadith, Hisnul Muslim and Rahe Belayat). See the dataset