Musnad Ahmad

It is narrated from Hazrat Abu Huraira (may Allah be pleased with him) that the Noble Prophet (peace and blessings be upon him) said: When the day of Friday comes, angels come to every door of the mosques and record the reward of the worshipper who comes first and second, and when the Imam comes out, the angels fold up those scrolls and registers and enter the mosque to listen to the remembrance. And the Noble Prophet (peace and blessings be upon him) said: The one who comes first for the Friday prayer receives a reward like one who sacrifices a camel; the one who comes second receives a reward like one who sacrifices a cow; the one who comes third receives a reward like one who sacrifices a goat; then a duck, then a chicken, then like one who gives an egg in charity.