Musnad Abu Ya'la al-Mawsili 248:40

And from Jabir ibn Samurah, he said: The Messenger of Allah (peace and blessings of Allah be upon him) said: "Will you not line up as the angels line up before their Lord?" He said: "How do the angels line up before their Lord?" He said: "They complete the first rows and they stand close together in the row."