It is narrated from Hazrat Abu Huraira that the Prophet (peace and blessings be upon him) said: The angels stand at the doors of the mosque and keep writing the people according to their ranks, that so-and-so came at such-and-such time and so-and-so came at such-and-such time. So-and-so came when the Imam was delivering the sermon, and so-and-so only performed the prayer and did not participate in the sermon.