Mbh 12.244.2a

"'"Vyasa said, 'When the householder beholds wrinkles on his body and white hair on his head, and children of his children, he should then retire into the forest. The third part of his life he should pass in the observance of the Vanaprastha mode. He should attend to those fires to which he had attended as a householder. Desirous of sacrificing, he should adore the deities (according to the rituals ordained). Observant of vows and abstemious in diet, he should eat only once, the time thereof being the sixth part of the day. He should be always heedful. Attending to his fires, he should keep some kine, waiting upon them dutifully.[1005] He should attend to all the rituals of a sacrifice. He should live upon rice growing indigenously, upon wheat growing under similar circumstances, upon grain of other kinds, growing wildly (and belonging to none). He should eat what remains after feeding guests. In this the third mode of life, he should present offerings of clarified butter in the five well-known Sacrifices.[1006] Four kinds of courses of conduct have been laid down for observance in the Vanaprastha mode of life. Some collect only what is needed for the day. Some collect stores to last for a month. Some store grain and other necessaries sufficient to last for twelve years. Forest recluses may act in these ways for worshipping guests and performing sacrifices. They should during the season of the rains, expose themselves to rain and betake themselves to water during the autumn. During the summer they should sit in the midst of four fires with the sun burning overhead. Throughout the year, however, they should be abstemious in diet.[1007] They sit and sleep on the bare earth. They stand on only their toes. They content themselves with the bare earth and with small mats of grass (owning no other furniture for seat or bed). They perform their ablutions morning, noon, and evening (preparatory to sacrifices). Some amongst them use only teeth for cleaning grain.