Sunan an-Nasa'i 1447
سنن النسائي#1447SahihIt was narrated from Anas bin Malik that he said:"I prayed two rak'ahs with the Messenger of Allah (ﷺ) in Mina, and with Abu Bakr and 'Umar, and two rak'ahs with 'Uthman at the beginning of his Caliphate
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Abu GhuddahSahih Lighairihi
Al-AlbaniSahih
Zubair Ali ZaiIsnaad Hasan
In-book reference: 15:15