Charles Ellicott Commentary 2 Chronicles 30:19

"that setteth his heart to seek God, Jehovah, the God of his fathers, though [he be] not [cleansed] according to the purification of the sanctuary." — 2 Chronicles 30:19 (ASV)

That prepareth. — Has directed. The division of verses here is obviously incorrect. (The mistake was doubtless caused by the omission of the relative in the Hebrew between kol, “every one,” and lĕbâbô hçkîn, “his heart he has directed.” The construction is parallel to that in 1 Chronicles 15:12, unto the place that I have prepared for it; according to the Septuagint.) The prayer is, “Jehovah the Good atone for every one who has directed his heart to seek the true God, even Jehovah, the God of his fathers, although not (literally, and not) according to the holy purifying”— i.e., although he has not rigorously observed the law of purification.

Purification of the sanctuary. —Or, holy purification: a phrase only found here (compare 1 Chronicles 23:28).

The prayer shows a preference for spiritual sincerity over mere literal observance of legal prescriptions, which is all the more remarkable because it occurs in a writer whose main aim is to foster a due reverence for the external ordinances and traditional customs of religion.