Sahih Muslim 1217
صحيح مسلم#1217SahihAbu Hazim reported:They (the people) came to Sahl b. Sa'd and they asked him of what thing the pulpit of the Messenger of Allah (ﷺ) was made, and the rest of the hadith is the same
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: 5:57