Sahih al-Bukhari 407
صحيح البخاري#407SahihNarrated `Aisha:(the mother of faithful believers) Allah's Messenger (ﷺ) saw some nasal secretions, expectoration or sputum on the wall of the mosque in the direction of the Qibla and scraped it off
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: 8:59