Sahih al-Bukhari 6231
صحيح البخاري#6231SahihNarrated Abu Huraira:The Prophet (ﷺ) said, "The young should greet the old, the passer by should greet the sitting one, and the small group of persons should greet the large group of persons
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: 79:5