21 The king gave this order to all the people: “Celebrate the Passover to the LORD your God, as it is written in this Book of the Covenant.”

Read 2 Kings 23:21 Using Other Translations

And the king commanded all the people, saying, Keep the passover unto the LORD your God, as it is written in the book of this covenant.
And the king commanded all the people, "Keep the Passover to the LORD your God, as it is written in this Book of the Covenant.
King Josiah then issued this order to all the people: “You must celebrate the Passover to the LORD your God, as required in this Book of the Covenant.”