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Hisn al-Muslim (Fortress of the Muslim) 248
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.)
Cited in Hisn al-Muslim (Fortress of the Muslim) (No. 248).