Sahih al-Bukhari 343
صحيح البخاري#343SahihNarrated `Ammar:The Prophet (ﷺ) stroked the earth with his hands and then passed them over his face and the backs of his hands (while demonstrating Tayammum)
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Every narration in Sahih al-Bukhari is accepted as Sahih (authentic) by the established status of the book.
In-book reference: 7:10