At the Rājasūya-yajña [sacrifice] performed by Mahārāja Yudhiṣṭhira, there was the greatest assembly of all the elite men of the world, the royal and learned orders, and in that great assembly Lord Śrī Kṛṣṇa was worshiped by one and all as the most exalted Personality of Godhead. This happened during my presence, and I remembered the incident in order to keep my mind upon the Lord.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
मुनिगणनृपवर्यसङ्कुलेऽन्तः- सदसि युधिष्ठिरराजसूय एषाम् । अर्हणमुपपेद ईक्षणीयो मम दृशिगोचर एष आविरात्मा
munigaṇanṛpavaryasaṅkule'ntaḥ- sadasi yudhiṣṭhirarājasūya eṣām | arhaṇamupapeda īkṣaṇīyo mama dṛśigocara eṣa āvirātmā
SB 1.9.41