Young Hezekiah has initiated a revival of godly worship in Judah.  Sacrifices were made and the celebration of song was restored in the land.  There were still more observations to be restored, and Judah went ahead with their revival. 

And Hezekiah sent to all Israel and Judah, and wrote letters also to Ephraim and Manasseh, that they should come to the house of the LORD at Jerusalem, to keep the passover unto the LORD God of Israel.  For the king had taken counsel, and his princes, and all the congregation in Jerusalem, to keep the passover in the second month.  For they could not keep it at that time, because the priests had not sanctified themselves sufficiently, neither had the people gathered themselves together to Jerusalem.  And the thing pleased the king and all the congregation.  So they established a decree to make proclamation throughout all Israel, from Beersheba even to Dan, that they should come to keep the passover unto the LORD God of Israel at Jerusalem: for they had not done it of a long time in such sort as it was written.  2 Chronicles 30:1-5

The new king has reinstituted the Passover feast, which is still significant to the Messiah.  This proclamation is not limited to Judah either, for he is offering revival to the northern tribes of Israel as well. 

 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.  And be not ye like your fathers, and like your brethren, which trespassed against the LORD God of their fathers, who therefore gave them up to desolation, as ye see.  Now be ye not stiffnecked, as your fathers were, but yield yourselves unto the LORD, and enter into his sanctuary, which he hath sanctified for ever: and serve the LORD your God, that the fierceness of his wrath may turn away from you.  For if ye turn again unto the LORD, your brethren and your children shall find compassion before them that lead them captive, so that they shall come again into this land: for the LORD your God is gracious and merciful, and will not turn away his face from you, if ye return unto him.  2 Chronicles 30:6-9

Hezikiah is boldly declaring the superiority of God to this brethren to the north.  He is not unforgiving or judgmental of those who left Jerusalem so long ago.  The messengers get the kind of reception you might expect from Israel.

So the posts passed from city to city through the country of Ephraim and Manasseh even unto Zebulun: but they laughed them to scorn, and mocked them.  Nevertheless divers of Asher and Manasseh and of Zebulun humbled themselves, and came to Jerusalem.  Also in Judah the hand of God was to give them one heart to do the commandment of the king and of the princes, by the word of the LORD.  And there assembled at Jerusalem much people to keep the feast of unleavened bread in the second month, a very great congregation.  And they arose and took away the altars that were in Jerusalem, and all the altars for incense took they away, and cast them into the brook Kidron.  Then they killed the passover on the fourteenth day of the second month: and the priests and the Levites were ashamed, and sanctified themselves, and brought in the burnt offerings into the house of the LORD.  2 Chronicles 30:10-15

The people of Israel mock and scorn the message of repentance, but not all of them.  Some do repent and return to Jerusalem for the Passover.  Even today some of Israel are coming to the lamb of our Passover who is also the Lion of Judah.  Note that Yeshua himself wrote letters to seven churches in Revelation, knowing that some were backslidden.  How reassuring to know that he will write to the weak churches to reach the few who are still ready to hear him.  Even the priests who were falling behind were moved to repent and serve again.  Common people who will tear down altars and idols can change the church.

  And they stood in their place after their manner, according to the law of Moses the man of God: the priests sprinkled the blood, which they received of the hand of the Levites.  For there were many in the congregation that were not sanctified: therefore the Levites had the charge of the killing of the passovers for every one that was not clean, to sanctify them unto the LORD.  For a multitude of the people, even many of Ephraim, and Manasseh, Issachar, and Zebulun, had not cleansed themselves, yet did they eat the passover otherwise than it was written. But Hezekiah prayed for them, saying, The good LORD pardon every one That prepareth his heart to seek God, the LORD God of his fathers, though he be not cleansed according to the purification of the sanctuary. 2 Chronicles 30:16-19

People were not purified properly but the Levites helped with their sacrifices.  No one was left out.  They asked God for forgiveness for this uncleanness in this special case.  If they were unclean by ritual, their hearts were clean by true repentance.

And the LORD hearkened to Hezekiah, and healed the people.  And the children of Israel that were present at Jerusalem kept the feast of unleavened bread seven days with great gladness: and the Levites and the priests praised the LORD day by day, singing with loud instruments unto the LORD.  And Hezekiah spake comfortably unto all the Levites that taught the good knowledge of the LORD: and they did eat throughout the feast seven days, offering peace offerings, and making confession to the LORD God of their fathers.  And the whole assembly took counsel to keep other seven days: and they kept other seven days with gladness.  For Hezekiah king of Judah did give to the congregation a thousand bullocks and seven thousand sheep; and the princes gave to the congregation a thousand bullocks and ten thousand sheep: and a great number of priests sanctified themselves. 2 Chronicles 30:20-24

God responded by healing people.  To be forgiven and to receive healing is motivation to celebration.  People released their secret sins and were made joyful.  People of every station made themselves holy again in this revival.

And all the congregation of Judah, with the priests and the Levites, and all the congregation that came out of Israel, and the strangers that came out of the land of Israel, and that dwelt in Judah, rejoiced.  So there was great joy in Jerusalem: for since the time of Solomon the son of David king of Israel there was not the like in Jerusalem.  Then the priests the Levites arose and blessed the people: and their voice was heard, and their prayer came up to his holy dwelling place, even unto heaven. 2 Chronicles 30:25-27

Hezakiah has moved the people to faith, and God has answered their prayers.  The nation is full of joy.  When hard times come they will have this joy to reinforce their faith.