Messenger of Allah ﷺ said, "If a fly falls in the vessel of any of you, let him dip all of it (into the vessel) and then throw it away, for in one of its wings there is a disease and in the other there is healing (antidote for it) i e. the treatment for that disease." (Using translation from Bukhārī 5782)
أَنَّ النَّبِيَّ ﷺ قَالَ إِذَا وَقَعَ الذُّبَابُ فِي شَرَابِ أَحَدِكُمْ فَلْيَغْمِسْهُ كُلَّهُ ثُمَّ لِيَطْرَحْهُ فَإِنَّ فِي أَحَدِ جَنَاحَيْهِشِفَاءً وَفِي الْآخَرِ دَاءً