Sahih Muslim 267
صحيح مسلم#267SahihIt is narrated on the authority of 'Abdullah that the Messenger of Allah (ﷺ) observed:He who has in his heart the weight of a mustard seed of pride shall not enter Paradise
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: 1:173