John Gill Commentary 2 Chronicles 35:18

"And there was no passover like to that kept in Israel from the days of Samuel the prophet; neither did any of the kings of Israel keep such a passover as Josiah kept, and the priests, and the Levites, and all Judah and Israel that were present, and the inhabitants of Jerusalem." — 2 Chronicles 35:18 (ASV)

Ver. 18-19. And there was no passover like to that kept in Israel

So exactly according to the law, so universally by Israel and Judah, and with such liberality shown by the king, and the chief of the priests and Levites; of this, and the following verse, (See Gill on 2 Kings 23:22), (See Gill on 2 Kings 23:23)