Mbh 13.93.4

"'Bhishma said, "People do regard a regular fast for a month or a half month as a penance. The truth, however, is that one who mortifies one's own body is not to be regarded either as an ascetic or as one conversant with duty[415]. Renunciation, however, is regarded as the best of penances. A Brahmana should always be an abstainer from food, and observe the vow called Brahmacharya.[416] A Brahmana should always practise self-denial restraining even speech, and recite the Vedas. The Brahmana should marry and surround himself with children and relatives, from desire of achieving righteousness. He should never sleep. He should abstain from meat. He should always read the Vedas and the scriptures. He should always speak the truth, and practise self-denial. He should eat Vighasa (viz., what remains after serving the deities and guests). Indeed, he should be hospitable towards all that come to his abode. He should always eat Amrita (viz., the food that remains in the house after all the family, including guests and servants have eaten) He should duly observe all rites and perform sacrifices."