2 Chronicles 30:2
For the king had taken counsel, and his princes, and all the congregation in Jerusalem, to keep the passover in the second month. For the king had taken counsel, and his princes, and all the congregation in Jerusalem, to keep the passover in the second month.
The verse records a joint agreement by the king, his princes, and all the congregation in Jerusalem to keep the Passover in the second month. That decision belongs to Hezekiah's first Passover celebration. That Passover was held nearly a century before Josiah's reform. Keeping it in the second month allowed the feast to be arranged promptly as part of reforms in the temple service.
The decision revived the ancient national Passover gathering, bringing both Judah and Israel together in Jerusalem after years when the division of the kingdom had made observance seem impracticable. The celebration served as an appeal to Judah and the northern tribes to return to God. At this Passover, provision was made for teaching priests to read the book of the law publicly to the people every day. Observing the statutes recorded by Moses, especially those in the book of the covenant that forms part of Deuteronomy, made Hezekiah's reign prosperous.