Sunan Abi Dawud 1516
سنن أبي داود#1516SahihNarrated Abdullah ibn Umar: We counted that the Messenger of Allah (ﷺ) would say a hundred times during a meeting: "My Lord, forgive me and pardon me; Thou art the Pardoning and forgiving One
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Al-AlbaniSahih
Muhammad Muhyi Al-Din Abdul HamidSahih
Shuaib Al ArnautHasan Sahih
Zubair Ali ZaiSahih
In-book reference: 8:101