Abu Huraira reported God’s messenger as saying, "When a fly alights in the vessel of any of you plunge it in, for in one of its wings there is disease and in the other a cure; it puts forward the one containing the disease, so dip it all in."
Abu Sa'id al-Khudri reported the Prophet as saying, "When a fly alights on food plunge it in, for one of its wings contains poison and the other a cure, and it puts the poison first and the cure second."
Al-'Abbas said, "Messenger of God, we wish to sweep out Zamzam, but in it there are some of these jinnan," meaning small snakes; so God’s messenger ordered that they should be killed.
