Once a demon named Ariṣṭāsura entered the village in the form of a great bull with a gigantic body and huge horns, digging up the earth with his hooves. When the demon entered Vṛndāvana, the whole land appeared to tremble, as if there were an earthquake. He roared fiercely, and after digging up the earth on the riverside, he entered the village proper. The fearful roaring of the bull was so piercing that some of the pregnant cows and women had miscarriages. Its body was so big, stout and strong that a cloud hovered over its body just as clouds hover over mountains. Ariṣṭāsura entered Vṛndāvana with such a fearful appearance that just on seeing this great demon all the men and women were afflicted with great fear, and the cows and other animals fled the village.
The situation became very terrible, and all the inhabitants of Vṛndāvana began to cry, “Kṛṣṇa! Kṛṣṇa, please save us!” Kṛṣṇa saw that the cows were running away, and He immediately replied, “Don’t be afraid. Don’t be afraid.” He then appeared before Ariṣṭāsura and said, “You lowest of living entities! Why are you frightening the inhabitants of Gokula? What will you gain by this action? If you have come to challenge My authority, then I am prepared to fight you.” In this way, Kṛṣṇa challenged the demon, and the demon became very angry by the words of Kṛṣṇa. Kṛṣṇa stood before the bull, resting His hand on the shoulder of a friend. The bull proceeded toward Kṛṣṇa in anger. Digging the earth with his hooves, Ariṣṭāsura lifted his tail, and it appeared that clouds were hovering about the tail. His eyes were reddish and moving in anger. Pointing his horns at Kṛṣṇa, he charged Him just like the thunderbolt of Indra. But Kṛṣṇa immediately caught his horns and tossed him away, just as a gigantic elephant repels a small inimical elephant. Although the demon was perspiring and appeared very tired, he took courage and got up. Again he charged Kṛṣṇa with great force and anger. While rushing toward Kṛṣṇa, he breathed very heavily. Kṛṣṇa again caught his horns and immediately threw him to the ground, breaking his horns. Kṛṣṇa then began to kick his body, just as one squeezes a wet cloth on the ground. Being thus kicked by Kṛṣṇa, Ariṣṭāsura rolled over and began to move his legs violently. Bleeding from the mouth and passing stool and urine, his eyes starting from their sockets, he passed to the kingdom of death.
The demigods in the celestial planets showered flowers on Kṛṣṇa for His wonderful achievement. Kṛṣṇa was already the life and soul of the inhabitants of Vṛndāvana, and after killing this demon in the shape of a bull, He became the cynosure of all eyes. With Balarāma, He triumphantly entered Vṛndāvana village, and the inhabitants glorified Him and Balarāma with great jubilation. When a person performs some wonderful feat, his kinsmen and relatives and friends naturally become jubilant.
It was after this incident that the great sage Nārada disclosed to Kaṁsa the secret of Kṛṣṇa. Nārada Muni is generally known as deva-darśana, which means that he can be seen only by demigods or persons on the same level with the demigods. But Nārada visited Kaṁsa, who was not at all on the level of the demigods, and allowed Kaṁsa to see him. Of course, Kaṁsa also saw Kṛṣṇa, what to speak of Nārada Muni. But unless one sees the Lord or His devotees with purified eyes, one cannot derive the actual benefit. Of course, anyone who associates with a pure devotee derives imperceptible benefit, which is called ajñāta-sukṛti. One cannot understand how he is making progress, yet he makes progress by seeing the devotee of the Lord. Nārada Muni’s mission was to finish things quickly. Kṛṣṇa appeared in order to kill the demons, and Kaṁsa was the chief among them. Nārada wanted to expedite things; therefore, he immediately approached Kaṁsa with all the real information. “You are to be killed by the eighth son of Vasudeva,” Nārada told Kaṁsa. “That eighth son is Kṛṣṇa. You were misled by Vasudeva into believing that the eighth issue of Vasudeva was a daughter. Actually, the daughter was born to Yaśodā, the wife of Nanda Mahārāja, and Vasudeva exchanged his son for the daughter, so you were misled. Kṛṣṇa is the son of Vasudeva, as is Balarāma. Being afraid of your atrocious nature, Vasudeva has tactfully hidden Them in Vṛndāvana, out of your sight.” Nārada further informed Kaṁsa, “Kṛṣṇa and Balarāma have been living incognito in the care of Nanda Mahārāja. All the asuras, your companions who were sent to Vṛndāvana to kill different children, were killed by Kṛṣṇa and Balarāma.”