It is narrated from Sayyiduna al-Agharr (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "O people, turn in repentance to your Lord, for by Allah, I turn in repentance to my Lord a hundred times in a day."
Hadith Referenceالمعجم الكبير للطبراني / باب الألف / 879