Sahih Bukhari
Sahih Bukhari Volume 005, Book 059, Hadith Number 352.
Hadith Section/Book: Sahih Bukhari Sahih Bukhari Book 59. Military Expeditions Led by the Prophet (PBUH) (Al-Maghaazi)
Narrated By 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.