قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم: ((وَاللَّهِ إِنِّي لأَسْتَغفِرُ اللَّهَ وَأَتُوبُ إِلَيْهِ فِي الْيَوْمِ أَكْثَرَ مِنْ سَبْعِينَ مَرَّةٍ)).
(The Messenger of Allah said: ‘By Allah, I seek forgiveness and repent to Allah, more than seventy times a day.)
Al-Bukhari, cf. Al-Asqalani, Fathul-Bari 11/101.