Mishkat al-Masabih #3977
Game and Animals Which May Be Slaughtered
The Arabic includes the chain of narration (sanad) and the collector's commentary; the English translation shows the Prophet's words only.
وَعَنْ أَبِي سَعِيدٍ الْخُدْرِيِّ رَضِيَ اللَّهُ عَنْهُ عَنِ النَّبِيِّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ قَالَ: «إِذَا وَقَعَ الذُّبَابُ فِي الطَّعَامِ فَامْقُلُوهُ فَإِنَّ فِي أَحَدِ جَنَاحَيْهِ سُمًّا وَفِي الْآخَرِ شِفَاءً وَإِنَّهُ يُقَدِّمُ السَّمَّ وَيُؤَخِّرُ الشِّفَاءَ» . رَوَاهُ فِي شرح السّنة
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."
It is transmitted in Sharh as-sunna.
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About Mishkat al-Masabih
This hadith is #3977 from Mishkat al-Masabih, in the Book of Game and Animals Which May Be Slaughtered.