“King Hezekiah had very great riches and honor. He made for himself treasuries for silver, gold, precious stones, spices, shields, and all kinds of costly objects. He built storehouses also for the yield of grain, wine, and oil. He had stalls for all kinds of cattle and sheepfolds. He likewise provided cities for himself. He had flocks and herds in abundance. God had given him very great possessions. This same King Hezekiah closed the upper outlet of the waters of Gihon. He directed them down to the west side of the city of David. King Hezekiah prospered in all his works. So also in the matter of the envoys of the princes of Babylon, who had been sent to him to inquire about the sign that had been done in the land. God left him to himself, in order to test him and to know all that was in his heart.”
King Hezekiah became very rich much like King Solomon. He had gold, silver, precious stones, spices, and expensive stuff. He also had huge storehouses for grain, wine, and oil, plus lots of livestock. He was a very rich guy. He diverted some water to the west side of Jerusalem with a pool and canal. King Hezekiah was very generous to the Babylonian envoys who wanted to make an alliance with the king of Judah. He showed them all the treasures of his realm, when they came to see him about his illness. This made the prophet Isaiah upset in 2 Kings, chapter 20. However, there is no mention of the Babylonian captivity here.