Sayyiduna Ibn Umar (may Allah be pleased with them both) narrates: I heard the Messenger of Allah (peace and blessings be upon him), in one sitting, seeking forgiveness one hundred times; he (peace and blessings be upon him) was saying: "My Lord, forgive me, have mercy on me, and accept my repentance; indeed You are the Ever-Accepting of repentance, the Most Merciful."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 13475