Abu Burdah narrated that a man from the Muhajirun heard the Messenger of Allah (peace and blessings be upon him) say: "O people, seek the forgiveness of Allah and turn in repentance to Him, for indeed I seek forgiveness and turn in repentance to Him in a day, or every day, a hundred times, or more than a hundred times."
Hadith Referenceالمعجم الكبير للطبراني / باب الألف / 882