It is narrated from Sayyiduna Abu Hurairah, may Allah be pleased with him, that a slave woman or a man used to clean the mosque. When the Prophet Muhammad, peace and blessings be upon him, did not find him, he inquired about him. They said: He has passed away. The Prophet, peace and blessings be upon him, said: "Why did you not inform me about him?" They replied, and the Prophet, peace and blessings be upon him, said: "Show me his grave." So the Prophet, peace and blessings be upon him, came to his grave and offered his funeral prayer.
Hadith Referenceمسند اسحاق بن راهويه / كتاب الجنائز / 243
Hadith Takhrij«بخاري ، كتاب الصلاة ، باب كنس المسجد النبى ، رقم : 458 . مسلم ، كتاب الجنائز ، باب الصلاة على القبر ، رقم : 956 . سنن ابوداود ، رقم : 3203 . مسند احمد : 353/2 . صحيح ابن حبان ، رقم : 3086 .»