Mbh 13.107.2b

Surrounded by the most beautiful damsels, he resides in the region of Indra. That man who eats only one meal every third day, and pours libations every day on his sacred fire for a period of a whole year,--indeed, he who thus attends to his fire every day and wakes up from sleep every morning before the sun is up, attains to the high merit of the Atiratra sacrifice. He acquires a car drawn by peacocks and swans and cranes. Proceeding to the region of the seven (celestial) Rishis, he takes up his residence there, surrounded by Apsaras of great beauty. It is well-known that such residence lasts for full three Padmas of years.[491] Fasting for three days in succession, he who takes only one meal every fourth day, and pours libations every day on his sacred fire, acquires the high merit of the Vajapeya sacrifice. The car he acquires is graced by celestial damsels of great beauty that have Indra for their father. He resides in the region of Indra for millions and millions of years and experiences great happiness by witnessing the sports of the chief of the deities. Fasting for four days in succession, he who eats only one meal every fifth day, and pours libations on the sacred fire every day for the period of a whole year, and who lives without cupidity, telling the truth, reverencing the Brahmanas, abstaining from every kind of injury, and avoiding malice and sin, acquires the merit of the Vajapeya sacrifice. The car he rides is made of gold and drawn by swans and endued with the effulgence of many suns rising together. He acquires a palatial mansion of pure white. He lives there in great happiness for full one and fifty Padmas of years.