Hisn al-Muslim
Repentance and seeking forgiveness — Du'a 2
وَقَالَ صلى الله عليه وسلم: ((يَا أَيُّهَا النَّاسُ تُوبُوا إِلَى اللَّهِ فَإِنِّي أَتُوبُ فِي اليَومِ إِلَيهِ مِائَةَ مَرَّةٍ)).
English meaning
He also said: ‘O People, Repent! Verily I repent to Allah, a hundred times a day.