Charles Ellicott Commentary 2 Chronicles 6:37

"yet if they shall bethink themselves in the land whither they are carried captive, and turn again, and make supplication unto thee in the land of their captivity, saying, We have sinned, we have done perversely, and have dealt wickedly;" — 2 Chronicles 6:37 (ASV)

Yet if they bethink themselves. —Compare with the marginal note. If they take it to heart, that is, repent (Deuteronomy 4:39).

We have sinned, we have done amiss, and have dealt wickedly. —Compare the same three verbs in Psalms 106:6; Daniel 9:5 (Kings puts the conjunction before the second verb). There is a climax: “we have slipped (or missed the mark), we have done crookedly, we have been godless.”