Asalamualikum,
Yes, this is interesting. Can anyone explain?
Shaykh Gibril Haddad
Only in modern times was it discovered that the common fly carried parasitic pathogens for many diseases including malaria, typhoid fever, cholera, and others. It was also discovered that the fly carried parasitic bacteriophagic fungi capable of fighting the germs of all these diseases.
The Prophet Muhammad - upon him and his House blessings and peace - alluded to both facts 1,400 years ago when he said, Abu Sa`id al-Khudri by al-Bukhari and in the Sunan:
<< If a fly falls into one of your containers [of food or drink], immerse it completely (falyaghmis-hu kullahu) before removing it, for under one of its wings there is venom and under another there is its antidote. >>
A version from Abu Hurayra in Abu Dawud, Ahmad, and al-Tahawi's Sharh Mushkil al-Athâr (8:341 #3293) adds:
<< And it [al-Tahawi: "always"] protects itself (yattaqi) with the wing that carries the poison, so immerse it completely.>>Ahmad and al-Tahawi add: << Then remove it. >>
A sound-chained version in Ahmad, al-Tahawi, al-Nasa'i, and Ibn Majah (the latter two mention only the second half) states:
<< Sa`id ibn Khalid sai in to see Abu Salama. He brought us some butter and date pastry. A fly fell into the dish. Abu Salama began to submerge it (yamquluhu) with his finger. I said, "Uncle! What are you doing?" He said: "Truly, Abu Sa`id al-Khudri told me that the Messenger of Allah said, 'In one of the fly's two wings there is poison and in another, its antidote. If it falls into food, submerge it in it; for it sends the poison first and keeps the cure last.'">>Al-Tahawi in Sharh Mushkil al-Athâr (8:339 #3289) has, << Uncle! Allah forgive you! What are you doing? >>
Al-Bazzar in his Musnad and al-Diya' al-Maqdisi in al-Ahadith al-Mukhtara (5:206) narrate from Thumama ibn `Abd Allah ibn Anas through trustworthy narrators according to Ibn Hajar in Fath al-Bari (10:250) and al-Qastallani in Irshad al-Sari (5:304):
<< Thumama said: We were with Anas and a fly fell into a vessel. Anas motioned with his hand and immersed it (faghamasahu) three times then said: "Bismillah" and he said that truly, thus did the Messenger of Allah order them to do. >>
Shah Wali Allah al-Dihlawi mentioned in Hujjat Allah al-Baligha that this hadith shows God-given knowledge of the many diseases a fly potentially carries as well as illustrates the Creator's wisdom in giving every venomous species some immunity or antidotal protection to its own poison insuring its survival. Shaykh Muhyi al-Din Ibn `Arabi in one of his Wasaya specified that the fly always keeps its "antidotal wing" off the substance in which it finds itself mired so as to try and use it to fly away. The Ulema said that this behavior is Divinely-inspired instinct similar to that of the bees, the ants, the hoopoe, and the earth in the Qur'an cf. al-Tahawi, Sharh Mushkil (8:343-344) and al-Khattabi, Ma`alim al-Sunan (4:459).
Ibn Hajar wrote in his commentary on this hadith:
"I found nothing among the variants to pinpoint the wing that carries the antidote but one of the Ulema said he observed that the fly protects itself with its left wing so it can be deduced that the right one is the one with the antidote.... Another said that the poison may be that of pride (takabbur) occurring in one's soul causing him to disdain eating that food or avoid and discard it altogether, while the antidote takes place by subduing the soul and forcing it to be humble."
Salam