Sahih al-Bukhari 902
صحيح البخاري#902SahihNarrated Aisha:(the wife of the Prophet) The people used to come from their abodes and from Al-`Awali (i.e. outskirts of Medina up to a distance of four miles or more from Medina). They used to pass through dust and used to be drenched with sweat and covered with dust; so sweat used to trickle from them. One of them came to Allah's Messenger (ﷺ) who was in my house. The Prophet (ﷺ) said to him, "I wish that you keep yourself clean on this day of yours (i.e. take a bath)
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: 11:26