Sahih al-Bukhari 1219
صحيح البخاري#1219SahihNarrated Abu Huraira:It was forbidden to keep the hands on the hips during the prayer. (This is narrated by Abu Huraira from the Prophet)
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: 21:23