John Gill Commentary Isaiah 37:7

"Behold, I will put a spirit in him, and he shall hear tidings, and shall return unto his own land; and I will cause him to fall by the sword in his own land." — Isaiah 37:7 (ASV)

Behold, 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
^F19 ; a spirit of fear and dread, which will oblige him to desist from his purposes, and flee; though some interpret it only of an inclination, a will ^F20 in him, to return: it may be understood of an angel, a ministering spirit, and be rendered "I will send a spirit against him"; an angelic spirit, as he did, which cut off his army in one night:

and he shall hear a rumour ;
of the sudden and total destruction of his army; though some refer this to the rumour of the king of Ethiopia coming out to make war against him, (Isaiah 37:9) , but upon this he did not return to his own land, nor was he slain with the sword, as follows:

and return to his own land ;
as he did, immediately upon the slaughter of his army by the angel:

and I will cause him to fall by the sword in his own land :
as he did, being slain by his own sons, (Isaiah 37:37Isaiah 37:38) .

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FOOTNOTES:

• F19: (xwr wb Ntwn) "indam ei Spiritum", Junius & Tremellius, Piscator.
• F20: So Ben Melech explains it by (Nwur) , "will", "desire", "purpose".