C. F. Keil and Franz Delitzsch on 2 Chronicles 30:20

2Ch 30:20

God heard this intercession, and healed the people. רפא, sanare, is not to be explained by supposing, with Bertheau, that first sickness, and then even death, were to be expected as the results of transgression of the law, according to Lev 15:31, and that the people might be already regarded as sick, as being on the point of becoming so. The use of the word is explained by the fact that sin was regarded as a spiritual disease, so that רפא is to be understood of healing the soul (as Psa 41:5), or the transgression (Hos 14:5; Jer 3:22).