Sayyiduna Anas bin Malik (may Allah be pleased with him) narrates: A man passed away and people carried his funeral by the Messenger of Allah (peace and blessings be upon him). The people spoke ill of him, so the Messenger of Allah (peace and blessings be upon him) said: "It has become obligatory." Then people passed by with another funeral and spoke well of him, so the Messenger of Allah (peace and blessings be upon him) said: "It has become obligatory." Sayyiduna Umar (may Allah be pleased with him) asked the Prophet (peace and blessings be upon him) about this, so he (peace and blessings be upon him) said: "You are Allah's witnesses on earth."