Sunan an-Nasa'i 1449
سنن النسائي#1449SahihIt was narrated that 'Abdur-Rahman bin Yazid said:"Uthman prayer four (rak'ahs) in Mina until news of that reached 'Abdullah who said: 'I prayed two rak'ahs with the Messenger of Allah (ﷺ)
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Abu GhuddahSahih
Al-AlbaniSahih
Zubair Ali ZaiSahih Muslim
In-book reference: 15:17