Mahabharata 13.80.1

युधिष्ठिर उवाच · yudhiṣṭhira uvāca

पवित्राणां पवित्रं यच्छ्रेष्ठं लोके च यद्भवेत्पावनं परमं चैव तन्मे ब्रूहि पितामह

pavitrāṇāṃ pavitraṃ yacchreṣṭhaṃ loke ca yadbhavetpāvanaṃ paramaṃ caiva tanme brūhi pitāmaha

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