Lord Śrī Kṛṣṇa, thus thinking to Himself, established Mahārāja Yudhiṣṭhira in the position of supreme control of the world in order to show the ideal of administration on the path of piety.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
एवं सञ्चिन्त्य भगवान्स्वराज्ये स्थाप्य धर्मजम् । नन्दयामास सुहृदः साधूनां वर्त्म दर्शयन्
evaṃ sañcintya bhagavānsvarājye sthāpya dharmajam | nandayāmāsa suhṛdaḥ sādhūnāṃ vartma darśayan
SB 3.3.16