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Hisn al-Muslim (Fortress of the Muslim) 249
وَقَالَ صلى الله عليه وسلم: ((يَا أَيُّهَا النَّاسُ تُوبُوا إِلَى اللَّهِ فَإِنِّي أَتُوبُ فِي الْيَوْمِ إِلَيْهِ مِائَةَ مَرَّةٍ)).
(He also said: ‘O People, Repent! Verily I repent to Allah, a hundred times a day.)
Cited in Hisn al-Muslim (Fortress of the Muslim) (No. 249).