2 Kings 18:19

Speak ye now to Hezekiah Their message was first addressed to the king, but afterwards they turn (verse 29) to the people who had gathered to hear the parley. The briefer record of the Chronicler combines both parts of the conference and says the messengers were sent -unto Hezekiah … and unto all Judah that were at Jerusalem".

the great king Hezekiah would know that his own father Ahaz had been one of Assyria's tributaries, and that many other petty kings around were in the same condition. Hence the term is calculated to warn him against resistance.

What confidenceis this wherein thou trustest The question in Chronicles, being represented as at once addressed both to king and people, is put in the plural number -Whereon do yetrust"?