Srimad-Bhagavatam: Canto 1 - Chapter 1 - Verse 43

Sanskrit:

चीरवासा निराहारो बद्धवाङ्‍मुक्तमूर्धज: ।दर्शयन्नात्मनो रूपं जडोन्मत्तपिशाचवत् ।अनवेक्षमाणो निरगादश‍ृण्वन्बधिरो यथा ॥ ४३ ॥

ITRANS:

cīra-vāsā nirāhārobaddha-vāṅ mukta-mūrdhajaḥdarśayann ātmano rūpaṁjaḍonmatta-piśācavatanavekṣamāṇo niragādaśṛṇvan badhiro yathā

Translation:

After that, Mahārāja Yudhiṣṭhira dressed himself in torn clothing, gave up eating all solid foods, voluntarily became dumb and let his hair hang loose. All this combined to make him look like an urchin or madman with no occupation. He did not depend on his brothers for anything. And, just like a deaf man, he heard nothing.

Purport:

Thus being freed from all external affairs, he had nothing to do with imperial life or family prestige, and for all practical purposes he posed himself exactly like an inert mad urchin and did not speak of material affairs. He had no dependence on his brothers, who had all along been helping him. This stage of complete independence from everything is also called the purified stage of fearlessness.