Mahabharata 12.132.10

यदेनमाहुः पापेन चारित्रेण विनिक्षतम्स भृशं तप्यतेऽनेन वाक्शल्येन परिक्षतः

yadenamāhuḥ pāpena cāritreṇa vinikṣatamsa bhṛśaṃ tapyate'nena vākśalyena parikṣataḥ

Our plain-language meaning of this verse is waiting for scholar review.