Sunan Ibn Majah 106
سنن ابن ماجه#106SahihIt was narrated that 'Abdullah bin Salimah said:"I heard 'Ali say: 'The best of people after the Messenger of Allah is Abu Bakr, and the best of people after Abu Bakr is 'Umar
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Al-AlbaniSahih
Muhammad Fouad Abd al-BaqiSahih
Zubair Ali ZaiSahih