From Sahih Muslim (Hadith 5850):
Abu Huraira reported Allah's Messenger (ﷺ) 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?
Reference: Muslim 5850