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.

"Behold, I am going to put a spirit in him so that he will hear news and return to his own land. And I will make him fall by the sword in his own land."'" Calvin's Commentary on the... · Smith's Bible Commentary

In this chapter we have him falling, and at last fallen, in answer to prayer, and in fulfillment of many of the prophecies which we have met with in the ...

I will send a blast upon him The king of Assyria; a pestilential one, as he afterwards did, which destroyed his army: or, I will put a spirit into him.

The themes of divine protection, trust in God's providence, and the fulfillment of prophecy are central to this verse. It serves as a reminder to King Hezekiah ...

This prophetic assurance signifies divine governance over nations, with God bringing judgment upon those who defy Him.

David Guzik commentary on Isaiah 37, where Hezekiah seeks the Lord as a response to the words of Rabshakeh, and Assyria gets destroyed.

King Hezekiah sends a delegation to Isaiah the prophet for advice and to seek the Lord's direction during this seemingly hopeless turn of events.

Isaiah 37:7 Listen! When he hears a certain report, I will make him want to return to his own country, and there I will have him cut down with the sword.

In this verse Yahweh says he will cause Sennacherib, the Assyrian king, to be killed. The Hebrew focusing particle rendered Behold emphasizes this threat.