Yahweh's Reply Through Isaiah (Isaiah 37:21-35).
‘Then Isaiah the son of Amoz sent to Hezekiah, saying, “Thus says Yahweh the God of Israel, In lieu of the fact that you have prayed to me against Sennacherib, king of Assyria, this is the word which Yahweh has spoken concerning him. ‘The virgin daughter of Zion has despised you and laughed you to scorn. The daughter of Jerusalem has shaken her head after you.' ” '
God's reply to him came through Isaiah. It is Isaiah who is in control of things not Hezekiah. God has heard Hezekiah's prayer, and, because he has put his trust in Him, tells him what His word against Sennacherib is. ‘Yahweh has spoken.' And being the word of Yahweh it is not only spoken but will be powerfully effective.
His message is in derisory tones. Sennacherib is likened to the great and important suitor who is scorned by the young woman, Jerusalem. She has rejected his offer with laughter because she despises him. She shakes her head at him as he departs, the forlorn and rejected suitor. Such is Jerusalem's reply to the Great King. He is dismissed as an unsuitable suitor, to walk away with head bowed.
God's Reply to Sennacherib's Claim to Omnipotence.
“Whom have you reproached and blasphemed? And against whom have you raised your voice and lifted up your eyes on high? Even against the Holy One of Israel. By your servants you have reproached the Lord (i.e. the One Who is truly Lord), and have said, ‘With the multitude of my chariots I have come up to the height of the mountains, to the innermost parts of Lebanon. And I will cut down its tall cedars, and its choice fir trees, and I will enter into his furthest height, the forest of his fruitful field. I have dug and drunk water, and with the sole of my feet I will dry up all the rivers of Egypt.' ”
But it is not only his rejection by Jerusalem that needs to be considered. That was dealt with in derisory fashion. Now the more serious charge is to be dealt with. By his actions and words he has brought into disrepute the Unique One, the Holy One of Israel, the Sovereign Lord Who is over all things, and challenged His omnipotence. His words have been a reproach against His very Name and therefore sheer blasphemy. The picture is vivid. He has raised both his voice and his eyes in arrogant defiance. ‘On high' stresses the crime. He had to lift up his eyes because he was challenging the One Who is on high.
‘Raised your voice and lifted up your eyes on high.' The verbs were used of God's glory in Isaiah 6:1. So the idea may be of one who was seeking to imitate God.
Furthermore he has boasted about what he was going to do with his power and might, his omnipotence (his multitude of chariots, those final proofs of man's might). He was going to humiliate Lebanon and dry up Egypt. ‘Lebanon' here includes the whole land of Canaan, as often elsewhere. The destruction of trees except for specific purposes was by general acknowledgement not a part of warfare, but Sennacherib defies convention. He is above them. He comes to destroy the trees, bringing dismay on the population. But he does not only intend to destroy the trees, he sees them and the rivers as also representing the proud peoples who live there whom he will humiliate. So Lebanon will be denuded of both great men and trees. He, Sennacherib, is lord of the land and of what it produces, and will rid Lebanon of its choicest fruit.
And he is also lord of water supplies. Whenever he digs, he drinks water. His diggings never fail. In other words, when he wishes for it, it is always there under his control. And thus he can, and will, dry up the Nile and its tributaries by the use of his foot, by simply treading on it, together with people who live by it (the whole of Egypt). In this way all that Lebanon and Egypt were renowned for will be destroyed by his seemingly omnipotent power, and all their people will be cut or trodden down. All will be humbled before him. He would show the world what he was. It is quite probable that this was based on exact words known to be used by Sennacherib in his diatribes.
And indeed, rather ironically, showing the world what he was is exactly what he did do, and was the reason why God would destroy him.