Narrated Nafi: Ibn 'Umar used to kill all kinds of snakes until Abu Lubaba Al-Badri told him that the Prophet had forbidden the killing of harmless snakes living in houses and called Jinan. So Ibn 'Umar gave up killing them.
— Sahih Bukhari, Volume 5, Book 59: Military Expeditions led by the Prophet (pbuh) (Al-Maghaazi), Hadith #352