It is narrated from Hazrat Abu Umamah (may Allah be pleased with him) that the Noble Prophet (peace and blessings be upon him) said: On the day of Jumu'ah, the angels come and sit at the doors of the mosques and record the names of those who come first, second, and third. When the Imam comes out, the registers are closed. The narrator asked, "O Abu Umamah! Do those who join the Jumu'ah after the Imam has come out receive no reward?" He replied, "Why not? But their names are not written in those registers."