Sunan an Nasai
813
Sahih+2

It was narrated from Anas that the Prophet (ﷺ) used to say:"Make your rows straight, make your rows straight, make your rows straight. By the One in Whose Hand is my soul! I can see you behind me as I can see you in front of me

SahihAbu Ghuddah
SahihAl-Albani