'Passover' in the Bible

The king ordered all the people, "Observe the Passover of the Lord your God, as prescribed in this scroll of the covenant."

He issued this edict because a Passover like this had not been observed since the days of the judges; it was neglected for the entire period of the kings of Israel and Judah.

But in the eighteenth year of King Josiah's reign, such a Passover of the Lord was observed in Jerusalem.