2 Chronicles 35:1

Overview - 2 Chronicles 35
Josiah keeps a most solemn passover.
20 He provoking Pharaoh-necho, is slain at Megiddo.
25 Lamentations for Josiah.
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2 Chronicles 35:1  (King James Version)
Moreover Josiah kept a passover unto the LORD in Jerusalem: and they killed the passover on the fourteenth day of the first month.

The whole solemnity was performed with great exactness according to the law, and upon that account there was none like it since Samuel's time; for even in Hezekiah's passover there were several irregularities
Bp. Patrick observes, that in this also it exceeded the other passovers which preceding things had kept, that though Josiah was by no means so rich as David, or Solomon, or Jehoshaphat, yet he furnished the congregation with beasts for sacrifice, both paschal and eucharistical, at his own proper cost and charge, which was more than any king ever did before.
30:1-27 2 Kings 23:21-23

the fourteenth
Exodus 12:6 ; Numbers 9:3 ; Deuteronomy 16:1-8 ; Ezra 6:19 ; Ezekiel 45:21
Josiah's solemnization of the passover, which is merely alluded to at 2 ; Ki 23:21 is very particularly related her, while the destruction of idolatry is largely related in the Kings, and here only touched upon. The feasts of the Lord God, appointed by the ceremonial law, were very numerous; but the passover was the chief. It was the first which was solemnized in the night wherein Israel came out of Egypt, and ushered in those which were afterwards instituted: and it was the last great feast which was held in the night wherein Christ was betrayed, before the vail of the temple was rent in twain. Be means of this feast, both Josiah and Hezekiah revived religion in their day.