Sadly, for the most part, Israel wanted no part of Hezekiah's revival. Even though the Assyrians had been used by God to teach them a serious lesson, most of them had missed it altogether. 2nd Chronicles 30:10 tells us that the honorable messengers out of Judah were mocked and laughed at when they were delivering their message to Israel.
Not everyone resented Hezekiah's spiritual advances though. Some of the Jews from Asher, Manasseh and Zebulun, did respond positively and came to the feast. What a wonderful time it was too. God granted unity to the nation once again; unity like the children of Jacob had not enjoyed since the days of Solomon. It was such a special time of sincerity, repentance and worship that God even suspended some of Moses' strict regulations and received the people despite their outward uncleanness (2nd Chronicles 30:18-20).