Ubayd bin Hunayn (may Allah have mercy on him) heard Sayyiduna Abu Hurayrah (may Allah be pleased with him) say that the Messenger of Allah (peace and blessings be upon him) said: "When a fly falls into the drink of one of you, immerse it entirely, then take it out, for in one of its two wings there is disease and in the other there is cure."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الطهارة / 1190
Sayyiduna Abu Hurayrah (may Allah be pleased with him) says that the Messenger of Allah (peace and blessings be upon him) said: "When a fly falls into the vessel of one of you, in one of its two wings there is disease and in the other there is cure, and it protects itself with the one in which there is disease; so immerse it entirely and take it out."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الطهارة / 1191
Sa'id bin Khalid al-Qarizi says: I came to Abu Salamah bin Abd al-Rahman at Mina, and he offered me butter. A fly fell into the butter, and he was dipping it with his little finger. I said: O maternal uncle! What are you doing? He said: Sayyiduna Abu Sa'id al-Khudri (may Allah be pleased with him) informed me that the Messenger of Allah (peace and blessings be upon him) said: "When a fly falls into the food of one of you, dip it in, for in one of its two wings there is poison and in the other there is cure, and it keeps the wing with the cure back and puts the wing with the poison in first."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الطهارة / 1192
Sayyiduna Salman (may Allah be pleased with him) says that the Prophet (peace and blessings be upon him) said: "O Salman! Use every food and drink into which a creature that has no blood falls and dies, for eating it, drinking it and performing ablution with it is lawful." (b) Baqiyyah narrated it like the previous narration.
(c) Abu Ahmad (may Allah have mercy on him) says: The hadiths that Sa'id al-Zubaydi narrates are, in general, not mahfuz (preserved). (d) Al-Hafiz Ali bin Umar (may Allah have mercy on him) says that no one but Baqiyyah narrates from Sa'id al-Zubaydi, and he is da'if (weak).
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الطهارة / 1193
Ibrahim (may Allah have mercy on him) says: Ablution is not to be performed (with water into which) any creature with flowing blood (has fallen), but when a beetle, a scorpion, a locust or a cricket falls into a vessel, there is no harm (in using it).
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الطهارة / 1194