عَنْ أَبِي هُرَيْرَةَ قَالَ: قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: «كُلُّ ذِي نَابٍ منَ السِّباعِ فأكلُه حرامٌ» . رَوَاهُ مُسلم

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." Muslim transmitted it.