It is narrated from Hazrat Jabir (may Allah be pleased with him) that once the Prophet (peace and blessings be upon him) entered the mosque and saw some people raising their hands. The Prophet (peace and blessings be upon him) said: What is the matter with these people that they gesture with their hands as if they are the tails of unruly horses? Remain calm in prayer. Then once the Prophet (peace and blessings be upon him) came to us and said: What is the matter that I see you divided into different groups? (At that time the companions were sitting in this manner.) Then one day the Prophet (peace and blessings be upon him) came out and said to us: Why do you not align your rows as the angels align before their Lord? The companions asked: O Messenger of Allah, how do the angels align before their Lord? The Prophet (peace and blessings be upon him) said: They complete the front rows first and fill the gaps in the rows.