Bhagavatapurana 1.19.5

1.19.5

atho vihāyemam amuṃ ca lokaṃ vimarśitau heyatayā purastāt /
kṛṣṇāṅghrisevām adhimanyamāna upāviśat prāyam amartyanadyām //

5. Thereupon, having renounced this as well as the other world (of the celestials) which had been already thought of and concluded as fit to be rejected, and believing the worship of Sri Krishna's feet to be the highest purpose (to be gained in life), he sat on the bank of the river of the immortals with the vow of fasting (for the remaining seven days).