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The Mahapurana, Uttara Purana
11. "There is no other dharma than the dharma of the Jinas, and from it comes the supreme happiness." Thus, the thought of this renunciation arose in the heart of the king.
12. Having entrusted the heavy burden of the kingdom to his son, Atiratha, the king, who was destined to become a Jina, took upon himself the light burden of tapas.
13. He took initiation from the Arhanandan Jina, studied the eleven angas, and with the desire to conquer the enemy of delusion, he renounced attachment even to his own body.
14. He made a vow to become a Tirthankara, being endowed with the qualities of right faith, humility, and other causes for the attainment of the desired goal. For those who are wise, they act in such a way that leads to the attainment of their desired goal.
15. At the end of his life, he renounced the world, bound himself to the highest lifespan, and attained the position of Ahamindra in the Vaijayanta Vimana. There, his body had one arm raised.
16. He breathed once every sixteen months and fifteen days, and he took mental nourishment after thirty-three thousand years.
17. He possessed the white radiance, his brilliance extended to the limits of the universe, he could perform actions at that distance, and he had the power to uproot and throw away the universe.
18. The happiness of Ahamindra is the supreme happiness, it is free from duality, free from doubt, and free from attachment. The soul of King Ratishena attained this happiness.
19. When the time came for Ahamindra to take birth again, he was born in the Jambudvipa, in the Bharat Kshetra, in the city of Ayodhya, to King Megharatha. He was a Kshatriya, born in the lineage and gotra of Lord Rishabhadeva, free from enemies, and highly praiseworthy. Mangala was his queen, who was honored with great blessings like rain of jewels.
20. On the second day of the bright fortnight of Shravan, in the Magha Nakshatra, he saw sixteen dreams, including an elephant, and he saw an elephant entering his mouth. At that time, he entered the womb of the queen.
21. Knowing the meaning of the dreams from her husband, the queen was overjoyed.
22. Then, on the eleventh day of the bright fortnight of Chaitra, in the ninth month, in the Chitra Nakshatra and Pitri Yoga, she gave birth to the soul of Ahamindra, the holder of three knowledges, the best among the righteous, and the lord of the three worlds.
23. As always, the Indra gods took the Jina child to Mount Meru, celebrated his birth festival, and brought him back to his body, giving him the name Sumati.