Jami` at-Tirmidhi 1010
جامع الترمذي#1010SahihAnas bin Malik narrated:"The Messenger of Allah would walk in front of the funeral, as did Abu Bakr, Umar and Uthman
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 ZaiHasan
In-book reference: 10:46