Mukhtasar Muslim

Narrated from Sayyiduna Abu Hurairah (may Allah be pleased with him) that there was an Abyssinian woman who used to clean the mosque, or it was a young man, and regarding him the Messenger of Allah (peace and blessings be upon him) inquired. The people replied that he had died. The Prophet (peace and blessings be upon him) said, "Why did you not inform me?" It was as if they considered him insignificant and did not want to trouble the Noble Prophet (peace and blessings be upon him). The Prophet (peace and blessings be upon him) said, "Show me his grave." The people showed it to him, so the Prophet (peace and blessings be upon him) offered prayer over it and said: "These graves are filled with darkness, and Allah, because of my prayer, illuminates them for their inhabitants."