ENOfficial
Ibn Mas'ud reported God's messenger as saying, "Kill all the snakes, and he who fears their revenge does not belong to me." Abu Dawud and Nasa'i transmitted it.
Source: sunnah.com
Other translations
Arabic
وَعَنِ ابْنِ مَسْعُودٍ قَالَ: قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: «اقْتُلُوا الْحَيَّاتِ كُلَّهُنَّ فَمَنْ خَافَ ثَأْرَهُنَّ فَلَيْسَ مِنِّي» . رَوَاهُ أَبُو دَاوُدَ وَالنَّسَائِيُّ
sunnah.com