Silsilah as-Sahihah 3029 — Various Duas from the Prophet ﷺ

Sayyiduna Abdullah bin Umar (may Allah be pleased with them both) says: We used to count that the Messenger of Allah (peace and blessings be upon him) would recite this supplication one hundred times in a single gathering: "O my Lord! Forgive me and turn towards me. Indeed, You are the Acceptor of repentance and the Most Forgiving."