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.

وَعَنْ أَبِي هُرَيْرَةَ أَنَّ رَسُولَ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ قَالَ: «مَنْ قَتَلَ وَزَغًا فِي أولَّ ضَرْبَة كتبت لَهُ مِائَةُ حَسَنَةٍ وَفِي الثَّانِيَةِ دُونَ ذَلِكَ وَفِي الثَّالِثَة دون ذَلِك» . رَوَاهُ مُسلم