Sunan Abi Dawud 4628
سنن أبي داود#4628SahihIbn ‘Umar said:When the Messenger of Allah (ﷺ) was alive, we used to say: The most excellent member of the community of the Prophet (ﷺ) after himself is Abu Bakr, then ‘Umar, then 'Uthman
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
Zubair Ali ZaiSahih
In-book reference: 42:33