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."
Narrated Ibn `Abbas:
(My mother) Umu-l-Fadl heard me reciting "Wal Mursalati `Urfan" (77) and said, "O my son! By Allah, your recitation made me remember that it was the last Sura I heard from Allah's Messenger. He recited it in the Maghrib prayer. "
Narrated Um Al-Fadl bint Al-Harith:
I heard the Prophet (ﷺ) reciting Surat-al-Mursalat `Urfan (77) in the Maghrib prayer, and after that prayer he did not lead us in any prayer till he died.
'Abdullah reported: We were with Allah's Messenger (ﷺ) in a cave when there was revealed to him (the Sura al-Mursalat, i. e. Sura lxxvii.:" By those sent forth to spread goodness" ) and we had just heard (it) from his lips that there appeared before us a snake. He said: Kill it. We hastened to kill it, but it slipped away from us, thereupon Allah's Messenger (ﷺ) said: Allah saved it from your harm just as he saved you from its evil.