Anas (May Allah be pleased with him) reported:
When the Iqamah had been announced, the Messenger of Allah (ﷺ) turned his face towards us and said: "Make your rows straight and stand close together, for I can see you from behind my back."[Al- Bukhari]. (DE)
App reference (DE): Book 9, Hadith 98 (DE)
Arabic/English book reference (DE): Book 9, Hadith 1088 (DE)