Military Expeditions led by the Prophet (pbuh) (Al-Maghaazi)
Bukhari :: Book 5 :: Volume 59 :: Hadith 352
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.
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