The Messenger of Allah (May peace be upon him) ordered a gecko to be killed, and calling it a noxious little creature.  

أَمَرَ رَسُولُ اللَّهِ ﷺ بِقَتْلِ الْوَزَغِ وَسَمَّاهُ فُوَيْسِقًا  

The Prophet ﷺ said: If anyone kills a gecko with the first blow, such and such number of good deeds will be recorded for him, if he kills it with the second blow, such and such number of good deeds will be recorded for him less than the former; and if he kills it with the third blow, such and such number of good deeds will be recorded for him, less than the former.  

قَالَ رَسُولُ اللَّهِ ﷺ مَنْ قَتَلَ وَزَغَةً فِي أَوَّلِ ضَرْبَةٍ فَلَهُ كَذَا وَكَذَا حَسَنَةً وَمَنْ قَتَلَهَا فِي الضَّرْبَةِ الثَّانِيَةِ فَلَهُ كَذَا وَكَذَا حَسَنَةً أَدْنَى مِنَ الأَوَّلِ وَمَنْ قَتَلَهَا فِي الضَّرْبَةِ الثَّالِثَةِ فَلَهُ كَذَا وَكَذَا حَسَنَةً أَدْنَى مِنَ الثَّانِيَةِ  

The Prophet ﷺ said: For the first blow seventy good deeds will be recorded.  

عَنِ النَّبِيِّ ﷺ أَنَّهُ قَالَ فِي أَوَّلِ ضَرْبَةٍ سَبْعِينَ حَسَنَةً