Sunan Abi Dawud 1515
سنن أبي داود#1515SahihAl-Agharr al-Muzani said (Musaddad in his version of this tradition said that he was a Companion of the Prophet):The Messenger of Allah (ﷺ) said: My heart is invaded by unmindfulness, and I ask Allah's pardon a hundred times in the day
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 ArnautSahih
Zubair Ali ZaiSahih Muslim (2702)
In-book reference: 8:100