The answer is: Judges

2 Kings 23:22

Josiah, the beloved king of Judah, holds a special place in the annals of biblical history for his vigorous reforms and commitments to purifying the worship practices of the Israelites. Undoubtedly, one of his most notable achievements was the reinstatement of the Passover, which, according to 2 Kings 23:22, had not been celebrated in such a manner since the days of the judges. This highlights a period that citizens viewed as a golden age of dedication and divine favor—a far cry from the corruption often associated with later kings of both Judah and Israel.

What's intriguing here is the essence of the Passover itself, steeped in rich theological significance. It commemorates the Israelites’ liberation from slavery in Egypt, symbolizing hope and new beginnings. So, Josiah, not only reinstating a holiday, was championing freedom and renewal against the backdrop of a spiritually tarnished environment.

Interestingly, this isn't just a solitary lesson—it echoes through history. Prophets regularly call the people back to their roots, asking them to remember the foundational moments that define their national identity. The account of Josiah's reign also reveals the importance of collective memory—a shared heritage—and how ordinary celebrations can force societies to confront their shortcomings.

So, in revisiting the ancient tradition of the Passover, Josiah invited the people to step back in time, thereby not just reinforcing an event from their past but instilling a deep sense of community and moral revitalization for their present and future. In highlighting such moments, the Bible continually encourages its readers to reflect and engage with their past to transform and inspire their present lives.