Abu Huraira reported God's messenger as saying, "If anyone kills a gecko with the first blow a hundred good deeds will be recorded for him, less if he kills it at the second and less still if he kills it at the third."
He reported God’s messenger as saying that when a prophet was stung by an ant he ordered a colony of ants to be burned, and God most high revealed to him, "Because an ant stung you you have burned a community which glorifies me."