Please explain the Hadith below: If a house fly falls in the drink of anyone of you, he should dip it (in the drink), for one of its wings has a disease and the other has the cure for the disease.Sahih Bukhari Vol. 4, Book 54, Hadith 537

This is not a shari masla. It is a psychological issue. Do not take this Hadith in the literal sense. It is only meant to discourage the spirit of arrogance, and to inculcate the spirit of modesty.