“The Messenger of
Allah (ﷺ) said: ‘Will you not form your rows as the angels form
their rows before their Lord?’ We said: ‘How do the angels form
their rows before their Lord?’ He said: ‘They complete the first
row and they stand close of one another in the line (leaving no gaps
between one another).’”
Sunan Ibn Majah Book 5, Hadith 190