2 Chronicles 30:21-23

And the children of Israel that were present at Jerusalem kept the feast of unleavened bread seven days with great gladness; and the Levites and the priests praised Jehovah day by day, singing with loud instruments unto Jehovah. And Hezekiah spake comfortably unto all the Levites that had good understanding in the service of Jehovah. So they did eat throughout the feast for the seven days, offering sacrifices of peace-offerings, and making confession to Jehovah, the God of their fathers. And the whole assembly took counsel to keep other seven days; and they kept other seven days with gladness.