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In the Harivamsha Purana,
The sage Vashishtha was performing the Tapana Yoga on the peak of a mountain. Seven goddesses, who were under his control due to his penance, approached him and asked, "What can we do for you, O Devata?" || 76 ||
The sage, who was a treasure trove of penance, replied, "I have no work for you." He dismissed them, and the goddesses, who were under his control, departed. || 77 ||
The sage Vashishtha was observing a fast for a month, without any desire for food. All the people wanted to offer him food during the Parana (breaking of the fast). || 78 ||
Once, King Ugrasena requested the people of Mathura to let him offer the Parana food to the sage. He stopped all the donors in Mathura from offering food. || 79 ||
The king forgot to offer the Parana food to the sage on three occasions. On the first occasion, he was busy with the arrival of Jarasandha's messenger. On the second occasion, a fire broke out, and he was preoccupied with managing it. On the third occasion, an elephant caused chaos in the city, and he was distracted by it. || 80 ||
The sage wandered through the entire city of Mathura in search of food, but he couldn't find any. Finally, exhausted from his efforts, he rested at the city gate. || 81 ||
Seeing him, someone said, "Alas, what a terrible thing the king has done! He himself did not offer food to the sage, and he also forbade others from doing so." || 82 ||
Hearing this, the sage was filled with anger. He remembered the goddesses who had come to him earlier. As soon as he remembered them, they appeared before him. Seeing them, he said, "You should do my work in another birth." The goddesses accepted his command and departed. The sage then left for the forest. || 83 ||
To humiliate King Ugrasena, the sage Vashishtha made a strong resolution: "I will be born as his son and take revenge." Due to this resolution, he was corrupted from his sagehood and entered the Mithyatva Gunasthan (state of falsehood). At that moment, he died and entered the womb of Queen Padmavati, the wife of King Ugrasena. || 84 ||
When Kansa's soul was in the womb of Padmavati, her body became extremely weak. One day, the king asked her in private, "My beloved, what is your ailment? Why have you become so thin and weak?" Padmavati replied, "My lord, the ailment I have due to the defect in the womb is not something that can be spoken of." || 85 ||
The king said, "It is necessary to speak about it. Tell me." || 86 ||