Narrated from Sayyiduna Abu Hurairah (may Allah be pleased with him): A black man or a black woman used to sweep the mosque. When he (or she) died, the Prophet (peace and blessings of Allah be upon him) asked about him (or her). The people said, "He (or she) has died." He said, "Why did you not inform me? (Well then) show me his (or her) grave." So the people showed it to him, and he (peace and blessings of Allah be upon him) offered the funeral prayer for him (or her).