Sahih Muslim 901
صحيح مسلم#901SahihIbn Mas'ud is reported to have said:The Messenger of Allah (ﷺ) taught me tashahhud taking my hand within his palms, in the same way as he taught me a Sura of the Qur'an, and he narrated it as narrated above
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: 4:63