Sahih Bukhari Volume 4, Book 59, Hadith 3299

قَالَ عَبْدُ اللَّهِ فَبَيْنَا أَنَا أُطَارِدُ، حَيَّةً لأَقْتُلَهَا فَنَادَانِي أَبُو لُبَابَةَ لاَ تَقْتُلْهَا‏.‏ فَقُلْتُ إِنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم قَدْ أَمَرَ بِقَتْلِ الْحَيَّاتِ‏.‏ قَالَ إِنَّهُ نَهَى بَعْدَ ذَلِكَ عَنْ ذَوَاتِ الْبُيُوتِ، وَهْىَ الْعَوَامِرُ‏

('Abdullah bin 'Umar further added): Once while I was chasing a snake in order, to kill it, Abu Lubaba called me saying: "Don't kill it," I said. "Allah's Apostle ordered us to kill snakes." He said, "But later on he prohibited the killing of snakes living in the houses." (Az-Zubri said. "Such snakes are called Al-Awamir.")