Mahabharata 13.3.13

तदाप्रभृति पुण्या हि विपाशाभून्महानदीविख्याता कर्मणा तेन वसिष्ठस्य महात्मनः

tadāprabhṛti puṇyā hi vipāśābhūnmahānadīvikhyātā karmaṇā tena vasiṣṭhasya mahātmanaḥ

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