It is narrated from Sayyiduna Abu Hurairah (may Allah be pleased with him) that the Noble Prophet (peace and blessings be upon him) said: "When a fly falls into the vessel of any one of you, then immerse the whole fly in the vessel, for in one of its wings is disease and in the other is cure." Imam Darimi (may Allah have mercy on him) said: Except for Hammad (bin Salamah), the narrators have reported this from Sayyiduna Anas (may Allah be pleased with him) through Thumamah, while other narrators have reported it from Sayyiduna Abu Hurairah (may Allah be pleased with him) through Qaqa'. And the first hadith which is narrated from Ubaid bin Hunaid is the most authentic of all.