Israafeel is the angel who will blow a horn (soor) signaling the end of the world. The Prophet (PBUH) was quoted by Aboo Sa‘eed as saying, “How can I enjoy when the horn blower has placed it in his mouth, inclined his forehead and turned his ear to hear, awaiting the command to blow…”
Collected by at-Tirmithee, Ibn Maajah and Ahmad (al-Hadis, vol. 4, p. 92, no. 21) and authenticated by al-Albaanee in Silsilah al-Ahaadeeth as-Saheehah, vol. 3, pp. 66-68.