Sahih Muslim 2228
صحيح مسلم#2228SahihMas'ud b. al-Hakam al-Ansari informed Nafi' that he had heard Hadrat 'Ali (may Allah be pleased with him), son of Abu Talib, say about the biers:Verily, the Prophet (ﷺ) used to stand first but later on kept sitting; but it is also narrated that Nafi' ibn Jubair saw Waqid b. 'Amr standing for a bier till it was placed down
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Every narration in Sahih Muslim is accepted as Sahih (authentic) by the established status of the book.
In-book reference: 11:105