2 Chronicles 30:21-23

And the people of Israel who were present at Jerusalem kept the Feast of Unleavened Bread seven days with great gladness, and the Levites and the priests praised the LORD day by day, singing with all their might to the LORD. And Hezekiah spoke encouragingly to all the Levites who showed good skill in the service of the LORD. So they ate the food of the festival for seven days, sacrificing peace offerings and giving thanks to the LORD, the God of their fathers. Then the whole assembly agreed together to keep the feast for another seven days. So they kept it for another seven days with gladness.