2 Chronicles 30:21-23

Young's Literal Translation

²¹ And the sons of Israel, those found in Jerusalem, make the feast of unleavened things seven days with great joy; and giving praise to Jehovah day by day are the Levites and the priests, with instruments of praise before Jehovah.

²² And Hezekiah speaketh unto the heart of all the Levites, those giving good understanding concerning Jehovah, and they eat the appointed thing seven days; sacrificing sacrifices of peace-offerings, and making confession to Jehovah, God of their fathers.

²³ And all the assembly take counsel to keep other seven days, and they keep seven days [with] joy;