Jamieson, Fausset and Brown on 2 Kings 18:14-16

14-16. Hezekiah ... sent to Lachish, saying, ... that which thou puttest on me will I bear--Disappointed in his expectations of aid from Egypt, and feeling himself unable to resist so mighty a conqueror who was menacing Jerusalem itself, Hezekiah made his submission. The payment of 300 talents of silver, and 30 talents of gold--£351,000--brought a temporary respite; but, in raising the imposed tribute, he was obliged not only to drain all the treasures of the palace and the temple, but even to strip the doors and pillars of the sacred edifice of the gold that adorned them.

2Ki 18:17-37. Sennacherib Besieges Jerusalem.