عَنْ أَبِي هُرَيْرَةَ قَالَ: قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: «إِذَا وَقَعَتِ الْفَأْرَةُ فِي السَّمْنِ فَإِنْ كَانَ جَامِدًا فَأَلْقُوهَا وَمَا حَوْلَهَا وَإِنْ كَانَ مَائِعًا فَلَا تَقْرَبُوهُ» . رَوَاهُ أَحْمد وَأَبُو دَاوُد وَرَوَاهُ الدَّارمِيّ عَن ابْن عَبَّاس

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 Dawud transmitted it.