Sahih Al Bukhari – Book of Invocations
Volume 008, Book 075, Hadith Number 319.
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Narrated By Abu Huraira
Razi Allah Anhu: I heard Allah's Apostle
Peace Be Upon Himsaying." By Allah! I ask for forgiveness from Allah and turn to Him in repentance more than seventy times a day."
Junaid Tahir