It is narrated from Sayyiduna Jabir bin Samurah (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "Will you not form rows as the angels form rows in the presence of their Lord?" The Companions said: O Messenger of Allah, how do the angels form rows in the presence of their Lord? He (peace and blessings be upon him) said: "They complete the front rows and stand close together in the row."
Hadith Referenceالمعجم الكبير للطبراني / باب الجيم / 2062