Sahih al-Bukhari 723
صحيح البخاري#723SahihNarrated Anas bin Malik:The Prophet (ﷺ) said, "Straighten your rows as the straightening of rows is essential for a perfect and correct prayer
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: 10:117