Mbh 13.111.13b

If a regenerate person, having studied the four Vedas, becomes stupefied by folly and accepts a gift from a fallen man, he has then to take birth in the asinine order. He has to live as an ass for five and ten years. Casting off his asinine form, he has next to take birth as an ox, in which state he has to live for seven years. Casting off his bovine form, he has next to take birth as a Rakshasa of regenerate order. Living as Rakshasa of the regenerate order for three months, he then regains his status (in his next birth) of a Brahmana.[510] A Brahmana, by officiating at the sacrifice of a fallen person, has to take birth as a vile worm. In this form he has to live for five and ten years, O Bharata. Freed from the status of a worm, he next takes birth as an ass. As an ass he has to live for five years, and then a hog, in which state also he has to remain for as many years. After that, he takes birth as a cock, and living for five years in that form, he takes birth as a jackal and lives for as many years in that state. He has next to take birth as a dog, and living thus for a year he regains his status of humanity. That foolish disciple who offends his preceptor by doing any injury to him, has certainly to undergo three transformations in this world. Such a person, O monarch, has in the first instance to become a dog. He has then to become a beast of prey, and then an ass. Living his asinine form, he has to wander for some time in great affliction as a spirit. After the expiration of that period, he has to take birth as a Brahmana. That sinful disciple who even in thought commits adultery with the wife of his preceptor, has in consequence of such a sinful heart, to undergo many fierce shapes in this world. First taking birth in the canine order he has to live for three years. Casting off the canine form when death comes, he takes birth as a worm or vile vermin. In this form he has to live for a year.