"The Messenger of Allah (ﷺ) came out to us and said:'Will you not form rows as the angels form rows before their Lord? They said: 'How do the angels form rows before their lord? He said: 'They complete the first row and fill the gaps in the rows."'
Sunan an-Nasa'i Book 10, Hadith 40
← Previous Hadith "Make your rows solid and close together, and keep your necks in line. By the One in Whose Hand is the soul of Muhammad! I can see the shaitan entering through the gaps in the rows as if they are small sheep."

Sunan an-Nasa'i Book 10, Hadith 39 Next Hadith → It was narrated from Al'Irbad bin Sariyah that the Messenger of Allah (ﷺ) used to send Salah on the first row three times and on the second row once.

Sunan an-Nasa'i Book 10, Hadith 41