He ordered the people living in Jerusalem to give the portion due the priests and Levites so they could devote themselves to the Law of the LORD. As soon as the order went out, the Israelites generously gave the firstfruits of their grain, new wine, oil and honey and all that the fields produced. They brought a great amount, a tithe of everything. The men of Israel and Judah who lived in the towns of Judah also brought a tithe of their herds and flocks and a tithe of the holy things dedicated to the LORD their God, and they piled them in heaps. They began doing this in the third month and finished in the seventh month. When Hezekiah and his officials came and saw the heaps, they praised the LORD and blessed his people Israel. That's great how the Israelites are so willing to give the best of all their food to somebody- without pay.
This is what Hezekiah did throughout Judah, doing what was good and right and faithful before the LORD his God. In everything that he undertook in the service of God's temple and in obedience to the law and the commands, he sought his God and worked wholeheartedly. And so he prospered. He prospered becuz he sought the LORD and worked wholeheartedly.