It is narrated from Sayyiduna Anas bin Malik (may Allah be pleased with him) that there was a black man who used to clean the mosque. He passed away at night and was buried during the night. When the Noble Prophet (peace and blessings be upon him) arrived, he was informed about this. The Prophet (peace and blessings be upon him) said: "Let us go to his grave. These graves are filled with darkness, and Allah Almighty illuminates them for their inhabitants because of my prayer over them." Then the Prophet (peace and blessings be upon him) came to his grave and performed his funeral prayer. An Ansari companion said: "O Messenger of Allah! My brother had passed away and you did not perform his funeral prayer." The Prophet (peace and blessings be upon him) asked: "Where is his grave?" He informed the Prophet (peace and blessings be upon him), and the Prophet (peace and blessings be upon him) went there with him.