Sahih al-Bukhari 3291
صحيح البخاري#3291SahihNarrated `Aisha:I asked the Prophet (ﷺ) about one's looking here and there during the prayer. He replied, "It is what Satan steals from the prayer of any one of you
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: 59:100