2 Chronicles 30:16
And they stood in their place after their manner, according to the law of Moses the man of God: the priests sprinkled the blood, which they received of the hand of the Levites. And they stood in their place after their manner, according to the law of Moses the man of God: the priests sprinkled the blood, which they received of the hand of the Levites.
This describes Hezekiah's first Passover. At that Passover the priests and Levites performed the worship as prescribed by the law of Moses, and the people kept the statutes given through Moses. The law was also read openly to the people by priests who taught it. Keeping those statutes helped bring prosperity to Hezekiah's reign. That prosperity was linked especially to keeping the covenant law contained in Deuteronomy.