Sahih Bukhari Volume 3, Book 28, Hadith 1831

حَدَّثَنَا عُمَرُ بْنُ حَفْصِ بْنِ غِيَاثٍ، حَدَّثَنَا أَبِي، حَدَّثَنَا الأَعْمَشُ، قَالَ حَدَّثَنِي إِبْرَاهِيمُ، عَنِ الأَسْوَدِ، عَنْ عَبْدِ اللَّهِ ـ رضى الله عنه ـ قَالَ بَيْنَمَا نَحْنُ مَعَ النَّبِيِّ صلى الله عليه وسلم فِي غَارٍ بِمِنًى، إِذْ نَزَلَ عَلَيْهِ ‏{‏وَالْمُرْسَلاَتِ‏}‏ وَإِنَّهُ لَيَتْلُوهَا، وَإِنِّي لأَتَلَقَّاهَا مِنْ فِيهِ، وَإِنَّ فَاهُ لَرَطْبٌ بِهَا، إِذْ وَثَبَتْ عَلَيْنَا حَيَّةٌ فَقَالَ النَّبِيُّ صلى الله عليه وسلم ‏"‏ اقْتُلُوهَا ‏"‏‏.‏ فَابْتَدَرْنَاهَا، فَذَهَبَتْ، فَقَالَ النَّبِيُّ صلى الله عليه وسلم ‏"‏ وُقِيَتْ شَرَّكُمْ كَمَا وُقِيتُمْ شَرَّهَا ‏"‏‏

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."