There are several most interesting things observable upon this occasion. The people first put away all the idolatrous altars before they proceeded to their pure worship. The old leaven of malice and wickedness must he put away by the followers of the Lord Jesus before they keep the feast of unleavened bread on the body and blood of Christ. 1 Corinthians 5:7-8. The sprinkling of the blood, according to the original institution, plainly shows that amidst the long dreadful reign of idolatry there were some precious souls who by faith looked to the blood of sprinkling in Jesus. Hebrews 12:24. The zeal of many upon this occasion outdoing the priests and Levites, is a delightful testimony also that the Lord had a seed alive in the midst of that degenerate nation, which though to the eye of men unknown like as it was in the days of Elijah, yet to the Lord were known, and by the Lord reserved from the general corruption. Romans 11:3-4. The unseasonable appointment of this passover which necessity had induced, and the quickness with which it was brought forward after it was determined upon, not allowing space for the usual preparation, the king implored the Lord to pardon, and to accept the people according to what they had, and not what they had not. And the Lord's gracious attention to the king's prayer and healing the people; these things, beheld with an eye to Jesus, are sweet gospel blessings veiled under these law dispensations. Reader! do not overlook your own personal concern in this. After all your preparations what sanctification is there in your best prayers and services. Need not the holiest of men to cry out, The good Lord pardon every one? Oh! how precious, how infinitely precious, is the thought, that the same worth, the same sin-atoning efficacy is in the Lamb that was slain, though there be new guilt and new defilement in our hearts and in our poor services, from day to day. The virtue and merits of Jesus's blood become the sanctification and cause of acceptance of his people forever.
2 Chronicles 30:15-20
15 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.
16 And they stood in their placec 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.
17 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.
18 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
19 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.
20 And the LORD hearkened to Hezekiah, and healed the people.