It is narrated from Hazrat Abu Huraira (may Allah be pleased with him) that the Noble Prophet (peace and blessings be upon him) said: Whoever offers the funeral prayer for someone will receive a reward equal to one qirat, and whoever waits until the burial is completed will receive a reward equal to two qirats, of which the smaller or one qirat is equal to the mountain of Uhud.
Hadith Referenceمسند احمد / مسند المكثرين من الصحابة / 7353