Hazrat Abu Huraira (may Allah be pleased with him) narrates that people passed by the Prophet Muhammad (peace and blessings be upon him) with a funeral, and its goodness was mentioned. The Prophet (peace and blessings be upon him) said: "It has become obligatory." Then another funeral passed by, and among its bad qualities, its evil was mentioned. The Prophet (peace and blessings be upon him) said: "It has become obligatory." Surely, you people are Allah's witnesses on earth.