It is narrated from Sayyiduna Ibn Umar (may Allah be pleased with them both) that once I was sitting with the Prophet (peace and blessings be upon him), and I heard the Prophet (peace and blessings be upon him) seeking forgiveness one hundred times. Then the Prophet (peace and blessings be upon him) said: «اللَّهُمَّاغْفِرْلِيوَارْحَمْنِيوَتُبْعَلَيَّإِنَّكَأَنْتَالتَّوَّابُالرَّحِيمُأَوْإِنَّكَتَوَّابٌغَفُورٌ» "O Allah, forgive me, have mercy on me, turn towards me. Indeed, You are the Most Accepting of Repentance, Most Merciful, or Most Forgiving."
Hadith Referenceمسند احمد / مسند المكثرين من الصحابة / 5354