(72) باب إِقْبَالِ الإِمَامِ عَلَى النَّاسِ عِنْدَ تَسْوِيَةِ الصُّفُوفِ
Narrated Anas bin Malik:
Once the Iqama was pronounced and Allah's Messenger (ﷺ) faced us and said, "Straighten your rows and stand closer together, for I see you from behind my back.'
Reference: Sahih al-Bukhari 719
In-book reference: Book 10, Hadith 114
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 1, Book 11, Hadith 687