Prophetic Commentary on the Qur'an (Tafseer of the Prophet (pbuh))
Bukhari :: Book 6 :: Volume 60 :: Hadith 454
Narrated Abdullah:
While we were with Allah's Apostle in a cave, Surat "Wal Mursalat" was revealed to him and we received it directly from his mouth as soon as he had received the revelation. Suddenly a snake came out and Allah's Apostle said, "Get at it and kill it!" We ran to kill it but it outstripped us. Allah's Apostle said, "It has escaped your evil, as you too, have escaped its."