Mahabharata 12.81.8

असाधुः साधुतामेति साधुर्भवति दारुणःअरिश्च मित्रं भवति मित्रं चापि प्रदुष्यति

asādhuḥ sādhutāmeti sādhurbhavati dāruṇaḥariśca mitraṃ bhavati mitraṃ cāpi praduṣyati

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