From Sahih Bukhari (Hadith 3317):
Narrated `Abdullah:Once we were in the company of Allah's Messenger (ﷺ) in a cave. Surat-al-Mursalat (77) was revealed there, and we were learning it from Allah's Messenger (ﷺ) . Suddenly a snake came out of its hole and we rushed towards it to kill it, but it hastened and entered its hole before we were able to catch it. Allah's Messenger (ﷺ) said," It has been saved from your evil and you have been saved from its evil
Reference: Bukhari 3317