Śatapatha Brāhmaṇa ("of a hundred paths") 13.8.1.11

13.8.1.11

guhā sadavatāpi syāt tadyadguhā bhavatyaghameva tadguhā karotyatha yadavatāpyasau vā ādityaḥ pāpmano'pahantā sa evāsmātpāpmānamapahantyatho ādityajyotiṣamevainaṃ karoti

Whilst being secluded it should have the sun shining on it from above: in that it is secluded one hides his sin; and in that it has the sun shining on it from above---yonder sun being the remover of evil--he, indeed, removes the evil from him, and he also causes him to be endowed with the radiance of the sun.