Atharvaveda 8.6.15

8.6.15

yéṣām paścā́t prápadāni puráḥ pā́rṣṇīḥ puró múkhā |
khalajā́ḥ śakadhūmajā́ úruṇḍā yé ca maṭmaṭā́ḥ kumbhámuṣkā ayāśávaḥ |
tā́n asyā́ brahmaṇas pate pratībodhéna nāśaya ||15||

Of whom the front-feet are behind, the heels in front, the faces in front, who are threshing-floor-born, dung-smoke-born, who are úruṇḍas and maṭmaṭás, pot-testicled, ayāçús (impotent?)—these from her, O Brahmaṇaspati, do thou make to disappear by attention (? pratībodhá).