Kings IV 23:21

21 And the king commanded all the people, saying, Keep the passover to the Lord your God, as it is written in the book of this covenant.

Kings IV 23:21 In-Context

19 Moreover Josias removed all the houses of the high places that were in the cities of Samaria, which the kings of Israel made to provoke the Lord, and did to them all that he did in Baethel.
20 And he sacrificed all the priests of the high places that were there on the altars, and burnt the bones of men upon them, and returned to Jerusalem.
21 And the king commanded all the people, saying, Keep the passover to the Lord your God, as it is written in the book of this covenant.
22 For a passover this had not been kept from the days of the judges who judged Israel, even all the days of the kings of Israel, and of the kings of Juda.
23 But in the eighteenth year of king Josias, was the passover kept to the Lord in Jerusalem.

The Brenton translation of the Septuagint is in the public domain.