That prepareth his heart to seek God, the Lord God of his fathers,.... Who was heartily desirous of worshipping God, and observing his ordinances, which had been enjoined their fathers, and they had kept; though Aben Ezra, as Kimchi observes, refers this to Hezekiah:

whose whole heart he directed, or prepared to seek the Lord, &c. by prayer and supplication for everyone of the said persons:

though he be not cleansed according to the purification of the sanctuary: according to the ceremonial law, which the service of the temple required; since, though they were attended with a ceremonial impurity, had a moral purity, and their hearts were right with God.

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.

30:19 The sanctuary - With that purification which was required of them that came in God's sanctuary. So he calls it to distinguish from that internal purity which they are here acknowledged to have. The great thing required in our attendance on God's ordinances is, that we prepare our heart to seek him; that the inward man be engaged, that we make heart work of it. All is nothing without this.

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.