Abu Dawud said: Humah means the biting of snakes and sting of the poisonous insects.
In-book : Book 29, Hadith 34
English translation : Book 28, Hadith 3879
29. Medicine (Kitab Al-Tibb)
باب كَرَاهِيَةِ مَسِّ الذَّكَرِ بِالْيَمِينِ فِي الاِسْتِبْرَاءِ