That the Messenger of Allah ﷺ said: "Whoever kills a gecko in one strike, he has such and such reward, and if he kills it on the second strike, he will have such and such reward, and if he kills it on the third strike, then he has such and such reward."  

أَنَّ رَسُولَ اللَّهِ ﷺ قَالَ مَنْ قَتَلَ وَزَغَةً بِالضَّرْبَةِ الأُولَى كَانَ لَهُ كَذَا وَكَذَا حَسَنَةً فَإِنْ قَتَلَهَا فِي الضَّرْبَةِ الثَّانِيَةِ كَانَ لَهُ كَذَا وَكَذَا حَسَنَةً فَإِنْ قَتَلَهَا فِي الضَّرْبَةِ الثَّالِثَةِ كَانَ لَهُ كَذَا وَكَذَا حَسَنَةً قَالَ وَفِي الْبَابِ عَنِ ابْنِ مَسْعُودٍ وَسَعْدٍ وَعَائِشَةَ وَأُمِّ شَرِيكٍ