Sahih Muslim 7506
صحيح مسلم#7506SahihHammam b. al-Harith reported that a person began to praise 'Uthman and Miqdad sat upon his knee; and he was a bulky person and began to throw pebbles upon his (flatterer's) face. Thereupon 'Uthman said:What is the matter with you? And he said: Verily, Allah's Messenger (ﷺ) said: When you see those who shower (undue) praise (upon others), throw dust upon their faces
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: 55:88