English translation
663. An-Nu'mān bin Bashīr said: "The Prophet ﷺ would line up our rows just as an arrow is aligned. When he thought that we had learnt this from him, and understood it (he stopped doing it) until one day, he turned around to face us, and saw a man whose chest was sticking out (of the row). So he said: 'You will of a surety establish your rows, or else Allāh will disfigure your faces.'" (Sahīh)
