(47) باب الْجَمَاعَةُ لِلْفَائِتِ مِنَ الصَّلاَةِ
It was narrated that Anas said:
"The Messenger of Allah (ﷺ) turned to face us when he stood up to pray, before he said Takbir, and said: 'Make your rows straight and fill the gaps, for I can see you from behind my back."' (RU)
Reference (RU): Sunan an-Nasa'i 845 (RU)
In-book reference (RU): Book 10, Hadith 69 (RU)
English translation (RU): Vol. 1, Book 10, Hadith 846 (RU)