Sunan an Nasai
816
Sahih+2

It was narrated that Jabir bin Samurah said:"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

SahihAbu Ghuddah
SahihAl-Albani