Musannaf Ibn Abi Shaybah 37805 — Frequently seeking forgiveness

It is narrated from Sayyiduna Ibn Umar (may Allah be pleased with them both) that he said: It used to be counted of the Messenger of Allah (peace and blessings be upon him), in a single sitting, that he (peace and blessings be upon him) would say: "My Lord, forgive me and accept my repentance. Indeed, You are the Accepter of repentance, the Forgiving," a hundred times.