Jami` at-Tirmidhi 1008
جامع الترمذي#1008SahihSalim bin Abdullah narrated that his father said:"I saw the Prophet, Abu Bakr, and Umar walking in front of the funeral
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Ahmad Muhammad ShakirSahih
Al-AlbaniSahih
Zubair Ali ZaiIsnaad Sahih
In-book reference: 10:44