Mahabharata 12.50.1

वैशंपायन उवाच · vaiśaṃpāyana uvāca

ततो रामस्य तत्कर्म श्रुत्वा राजा युधिष्ठिरःविस्मयं परमं गत्वा प्रत्युवाच जनार्दनम्

tato rāmasya tatkarma śrutvā rājā yudhiṣṭhiraḥvismayaṃ paramaṃ gatvā pratyuvāca janārdanam

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