Isaiah 37

As Assyrians surround Jerusalem -

"...the servants of king Hezekiah came to Isaiah.
6 ¶ And Isaiah said unto them, Thus shall ye say unto your master, Thus saith the Lord, Be not afraid of the words that thou hast heard, wherewith the servants of the king of Assyria have blasphemed me.
7 Behold, I will send a blast upon him, and he shall hear a rumour, and return to his own land; and I will cause him to fall by the sword in his own land."  (Isaiah 37:5–7)

And as Hezekiah receives the message of Isaiah -

"...Hezekiah went up unto the house of the Lord, and spread it before the Lord.
15 And Hezekiah prayed unto the Lord, saying,
16 O Lord of hosts, God of Israel, that dwellest between the cherubims, thou art the God, even thou alone, of all the kingdoms of the earth: thou hast made heaven and earth.
17 Incline thine ear, O Lord, and hear; open thine eyes, O Lord, and see: and hear all the words of Sennacherib, which hath sent to reproach the living God.
18 Of a truth, Lord, the kings of Assyria have laid waste all the nations, and their countries,
19 And have cast their gods into the fire: for they were no gods, but the work of men’s hands, wood and stone: therefore they have destroyed them.
20 Now therefore, O Lord our God, save us from his hand, that all the kingdoms of the earth may know that thou art the Lord, even thou only."  (Isaiah 37:14–20)

Isaiah follows with -

"Therefore thus saith the Lord concerning the king of Assyria, He shall not come into this city, nor shoot an arrow there, nor come before it with shields, nor cast a bank against it.
34 By the way that he came, by the same shall he return, and shall not come into this city, saith the Lord.
35 For I will defend this city to save it for mine own sake, and for my servant David’s sake."  (Isaiah 37:33–35)

And in fulfillment of prophecies of the Lord's prophet -

"...the angel of the Lord went forth, and smote in the camp of the Assyrians a hundred and fourscore and five thousand: and when they arose early in the morning, behold, they were all dead corpses."  (Isaiah 37:36)