Sunan an-Nasa'i 1831
سنن النسائي#1831SahihIt was narrated that Anas said:"The last time I saw the Messenger of Allah, he drew back the curtain when the people were in rows behind Abu Bakr, may Allah be pleased with him. Abu Bakr wanted to step back, but he gestured to them to stay as they were, and let the curtain drop. He died at the end of that day, and that was a Monday
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 - Agreed Upon
In-book reference: 21:14