The Book on Salutations and Greetings (Kitab As-Salam)
Muslim :: Book 26 : Hadith 5568
Abu Huraira reported Allah's Messenger (may peace be upon him) as saying: An Apostle from amongst the Apostles of Allah encamped under a tree, and an ant bit him, and he commanded his belongings to be removed from underneath the tree. He then commanded and it was burnt, and Allah revealed to bin):" Why one ant (which had bitten you) was not killed?"