Then the king commanded all the people, saying, "Keep the Passover to the LORD your God, as it is written in this Book of the Covenant."
2 Kings 23:21
Surrounding context
23:20 He executed all the priests of the high places who were there, on the altars, and burned men's bones on them; and he returned to Jerusalem.
23:21 Then the king commanded all the people, saying, "Keep the Passover to the LORD your God, as it is written in this Book of the Covenant."
23:22 Such a Passover surely had never been held since the days of the judges who judged Israel, nor in all the days of the kings of Israel and the kings of Judah.