Jami` at-Tirmidhi 1047
جامع الترمذي#1047SahihJa'far bin Muhammad narrated that:His father said: "The one who made the Lahd in the grave of the Messenger of Allah was Abu Talhah. And the one who placed the velvet cloth under him was Shuqran a freed slave of Messenger of Allah
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
Bashar Awad MaaroufHasan
Zubair Ali ZaiHasan
In-book reference: 10:83