Abu al-Ahwas al-Jushami narrates: Once Sayyiduna Abdullah bin Mas'ud (may Allah be pleased with him) was delivering a sermon when a snake was seen moving along the wall. Sayyiduna Abdullah bin Mas'ud (may Allah be pleased with him) broke off his sermon and struck it with a staff or a stick until he killed it. Then he said: I heard the Prophet (peace and blessings be upon him) say: "Whoever kills a snake, it is as if he has killed a polytheist whose blood had become lawful to shed."
Ahmad, Abu Ya'la and al-Bazzar recorded it in similar wording; al-Tabarani recorded it in al-Mu'jam al-Kabir both "marfu'" (attributed to the Prophet) and "mawquf" (stopping at the Companion). Al-Bazzar said in his narration, which is "marfu'": "Whoever kills a snake or a scorpion." In al-Tabarani's narration this is "mawquf". The narrators of al-Bazzar are the narrators of the Sahih.
Hadith Takhrij«اخرجه البزار فى المسند (1229 و1230) اخرجه أبو يعلى فى المسند (5320)، اخرجه الطبراني فى المعجم الكبير (10109) اخرجه احمد فى المسند (3746) ، أخرجه مسند أحمد برقم: 3738، وأخرجه مسند البزار برقم: 1985، 1847، وأخرجه المعجم الكبير للطبراني برقم: 9746»