So Ahaz sent messengers to Tiglathpileser king of Assyria,
&c.] Of whom see ( 2 Kings 15:29 ) saying, [I am] thy servant, and thy son;
signifying, that he would be his vassal, and become tributary to him, and serve him as a servant to his master, or a son his father, on condition he would come to his assistance, and so he became his servant; hence his son Hezekiah is said to rebel against the king of Assyria, ( 2 Kings 18:1 2 Kings 18:7 ) come up and save me out of the hand of the king of Syria, and out of
the hand of the king off Israel, which rise up against me;
which assistance he had no reason to call in, since the Lord had promised him deliverance from both those kings, and gave him a sign of it, ( Isaiah 7:4-16 ) .