yo 'smin snātvā mad-ākrīḍe
devādīḿs tarpayej jalaiḥ
upoṣya māḿ smarann arcet
sarva-pāpaiḥ pramucyate
yah -- who; asmin -- in this (Kaliya's lake in the Yamuna River); snatva -- bathing; mat-akride -- the place of My pastime; deva-adin -- the demigods and other worshipable personalities; tarpayet -- gratifies; jalaih -- with the water (of that lake); uposhya -- observing a fast; mam -- Me; smaran -- remembering; arcet -- performs worship; sarva-papaih -- from all sinful reactions; pramucyate -- he becomes freed.
According to the acaryas, the Lord spoke this verse to make it clear to Kaliya that he could by no means remain in the Yamuna lake. Although the Lord had mercifully pardoned the serpent and ordered him to go to the ocean with all his associates, Kaliya should not even consider requesting to remain in the lake, because it was now to become a holy place for spiritual pilgrims.