[Machine] I entered upon Abu Salamah and he brought us butter and a piece of cheese. Then a fly fell into the food, so Abu Salamah picked it up with his finger and threw it away. I said, "O Uncle, what are you doing?" He replied, "Abu Sa'eed Al-Khudri informed me that the Messenger of Allah ﷺ said: 'One of the wings of a fly contains poison, while the other contains a cure. So when a fly falls into the food, dip it fully, for the poison is on one wing, and the cure is on the other.'"  

دَخَلْتُ عَلَى أَبِي سَلَمَةَ فَأَتَانَا بِزُبْدٍ وَكُتْلَةٍ فَأُسْقِطَ ذُبَابٌ فِي الطَّعَامِ فَجَعَلَ أَبُو سَلَمَةَ يَمْقُلُهُ بِأُصْبُعِهِ فِيهِ فَقُلْتُ يَا خَالُ مَا تَصْنَعُ؟ فَقَالَ إِنَّ أَبَا سَعِيدٍ الْخُدْرِيَّ حَدَّثَنِي عَنْ رَسُولِ اللهِ ﷺ قَالَ إِنَّأَحَدَ جَنَاحَيِ الذُّبَابِ سُمٌّ وَالْآخَرَ شِفَاءٌ فَإِذَا وَقَعَ فِي الطَّعَامِ فَامْقُلُوهُ فَإِنَّهُ يُقَدِّمُ السُّمَّ وَيُؤَخِّرُ الشِّفَاءَ