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Krṣṇa,  the Supreme Personality of Godhead
and sometimes He used to go alone with His friends to the bank of the Yamunā and tend the cows. Gradually, the summer season arrived, and one day, while in the field, the boys and cows became very thirsty and began to drink the water of the Yamunā. The river, however, was made poisonous by the venom of the great serpent known as Kāliya.
Because the water was so poisonous, the boys and cows became visibly affected immediately after drinking. They suddenly fell down on the ground, apparently dead. Then Krṣṇa, who is the life of all lives, simply cast His merciful glance over them, and all the boys and cows regained consciousness and began to look at one another with great astonishment. They could understand that by drinking the water of Yamunā they had died and that the merciful glance of Krṣṇa restored their life. Thus they appreciated the mystic power of Krṣṇa, who is known as Yogeśvara, the master of all mystic yogīs.
Thus ends the Bhaktivedanta purport of the Fifteenth Chapter of Krṣṇa, “Killing of Dhenukāsura.”