18 Most of those who came from Ephraim, Manasseh, Issachar, and Zebulun had not purified themselves. But King Hezekiah prayed for them, and they were allowed to eat the Passover meal anyway, even though this was contrary to the requirements of the Law. For Hezekiah said, "May the Lord, who is good, pardon those 19 who decide to follow the Lord, the God of their ancestors, even though they are not properly cleansed for the ceremony." 20 And the Lord listened to Hezekiah's prayer and healed the people.
Matthew Henry's Commentary on 2 Chronicles 30:18-20
Commentary on 2 Chronicles 30:13-20
(Read 2 Chronicles 30:13-20)
The great thing needful in attendance upon God in solemn ordinances, is, that we make heart-work of it; all is nothing without this. Where this sincerity and fixedness of heart are, there may yet be many things short of the purification of the sanctuary. These defects need pardoning, healing grace; for omissions in duty are sins, as well as omissions of duty. If God should deal with us in strict justice, even as to the very best of our doings, we should be undone. The way to obtain pardon, is to seek it of God by prayer; it must be gotten by petition through the blood of Christ. Yet every defect is sin, and needs forgiveness; and should be matter to humble, but not to discourage us, though nothing can make up for the want of a heart prepared to seek the Lord.