2 Chronicles 30:6
So the posts went with the letters from the king and his princes throughout all Israel and Judah, and according to the commandment of the king, saying, Ye children of Israel, turn again unto the LORD God of Abraham, Isaac, and Israel, and he will return to the remnant of you, that are escaped out of the hand of the kings of Assyria.
This call belongs to Hezekiah's first Passover at the beginning of his reign in Judah after reforms in the temple service at Jerusalem, nearly a century before Josiah's reform. It was sent in the third year of Hoshea, when only a feeble remnant of the northern kingdom remained after Tiglath-pileser had carried away the tribes in Galilee and east of the Jordan, just before the kingdom would be swept away forever. Posts carried letters from the king and his princes throughout all Israel and Judah, from Beersheba to Dan, inviting Judah and Benjamin and all the northern tribes to come to Jerusalem to keep the Passover which had long been neglected. That invitation was to seek the Lord through renewal of the Passover festival.
The call urges the children of Israel to turn from idolatry back to the Lord God of Abraham, Isaac, and Israel, with the promise that He will return to the remnant escaped out of the hand of the kings of Assyria. It is a message of mercy offering Israel another chance to repent and return to God in their time of sorrow and distress. The chapter speaks to the position of God's people in the present, calling them to turn back to the Lord and give themselves wholly to Him with the same promise that He will return to them.
At this Passover provision was made for teaching priests to read the book of the law publicly to the people every day. Observance of the statutes given through Moses, especially those recorded in Deuteronomy in the book of the covenant, is what made Hezekiah's reign prosperous. The call came while judgments were awakening some of the ten tribes to seek better things, and its appeal to give themselves wholly to the Lord moved people of all ages to respond.
The remnant largely rejected the messengers with indifference and mockery, but some humbled themselves and came to Jerusalem to keep the Passover and the Feast of Unleavened Bread. In Judah God moved the people to unite in carrying out the king's command because it agreed with His revealed will.