SB 10.16.62
yo ’smin snatva mad-akride
devadims tarpayej jalaih
uposya mam smarann arcet
sarva-papaih pramucyate
Translation:
If one bathes in this place of My pastimes and offers the water of this lake to the demigods and other worshipable personalities, or if one observes a fast and duly worships and remembers Me, he is sure to become free from all sinful reactions.
Purport:
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.