Sahih Bukhari | Volume 3 | Hadith Number 56

Narrated by 'Abdullah
While we were in the company of the Prophet in a cave at Mina, when Surat-wal- Mursalat were revealed and he recited it and I heard it (directly) from his mouth as soon as he recited its revelation. Suddenly a snake sprang at us and the Prophet said (ordered us): "Kill it." We ran to kill it but it escaped quickly. The Prophet said, "It has escaped your evil and you too have escaped its evil."