Behold, I will send a blast upon him, and he shall hear a rumour, and shall return to his own land; and I will cause him to fall by the sword in his own land. (2 Kings 19:7)
Literally, “I will put a spirit in him.” The meaning of this passage is not clear. Perhaps what is meant is that God would place upon Sennacherib a spirit of trembling and fear, an impulse that would turn him from his thoughts of conquest and send him home in utter terror and dismay. The forecast is perhaps purposely vague, the Lord may not have desired at this time to reveal details.