Mahabharata 1.58.20

फेनपांश्च तथा वत्सान्न दुहन्ति स्म मानवाःन कूटमानैर्वणिजः पण्यं विक्रीणते तदा

phenapāṃśca tathā vatsānna duhanti sma mānavāḥna kūṭamānairvaṇijaḥ paṇyaṃ vikrīṇate tadā

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