when a fly alights in anyone’s vessel, he should plunge it all in, for in one of its wings there is a disease, and in the other is a cure. It prevents the wing of it is which there is a cure, so plunge it all in (the vessel). (Using translation from Abū Dāʾūd 3844)
"إِذَا وقَعَ الذُّبابُ في إناء أحدكُمْ فليغْمِسْهُ فإِنَّ في أحد جناحَيه داءً وفي الآخرِ شفاءً، وإنَّه يَتَّقى بجناحِه الَّذِي فيه الدَّاءُ، فَليغْمِسْه كلَّه، ثم ليَنْزِعْهُ" .