Musannaf Ibn Abi Shaybah

Hasan narrates that a funeral passed by the Prophet Muhammad (peace and blessings be upon him), and someone praised the deceased. Seeing this, many other tongues also praised him. The Prophet Muhammad (peace and blessings be upon him) said: "It has become obligatory for him." (Then once again) a funeral passed by the Prophet Muhammad (peace and blessings be upon him), and someone spoke ill of the deceased. Seeing this, many other tongues also spoke ill of him. The Prophet Muhammad (peace and blessings be upon him) said: "It has become obligatory for him." Hazrat Umar bin Khattab submitted: "O Messenger of Allah! When the first funeral passed and he was praised, you said, 'It has become obligatory,' and for the second one as well you said, 'It has become obligatory.' (What has become obligatory?)" The Prophet Muhammad (peace and blessings be upon him) said: "Indeed, you are Allah's witnesses on earth." He repeated this blessed sentence two or three times.