Hadith 1:18
and Abu Da’ud who added:
“It (the fly) protects itself with the diseased wing (by dipping it first in a drink).
وَأَبُو دَاوُدَ, وَزَادَ: { وَإِنَّهُ يَتَّقِي بِجَنَاحِهِ اَلَّذِي فِيهِ اَلدَّاءُ } (22)
Original Reference: Bulugh al-Maram 14