(71) باب تَسْوِيَةِ الصُّفُوفِ عِنْدَ الإِقَامَةِ وَبَعْدَهَا
Narrated Anas:
The Prophet (ﷺ) said, "Straighten your rows, for I see you from behind my back.'
Reference: Sahih al-Bukhari 718
In-book reference: Book 10, Hadith 113
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 1, Book 11, Hadith 686