For he saith, Are not my princes altogether kings?
Now therefore give pledges, I pray thee, to my master the king of Assyria, and I will give thee two thousand horses, if thou be able on thy part to set riders upon them.
2 Kings 18:24
How then wilt thou turn away the face of one captain of the least of my master's servants, and put thy trust on Egypt for chariots and for horsemen?
2 Kings 19:10
Thus shall ye speak to Hezekiah king of Judah, saying, Let not thy God in whom thou trustest deceive thee, saying, Jerusalem shall not be delivered into the hand of the king of Assyria.
For thus saith the Lord GOD; Behold, I will bring upon Tyrus Nebuchadrezzar king of Babylon, a king of kings, from the north, with horses, and with chariots, and with horsemen, and companies, and much people.
Thou, O king, art a king of kings: for the God of heaven hath given thee a kingdom, power, and strength, and glory.