The Great Epic of the Bhārata dynasty 12.186.12

12.186.12

amṛtaṃ brāhmaṇocchiṣṭaṃ jananyā hṛdayaṃ kṛtam |
upāsīta janaḥ satyaṃ satyaṃ santa upāsate || 12 ||

It is not laid down that one should eat (once more) at any intermediate period. He who eats according to this rule acquires the merit of a fast. At the hours ordained for Homa one should pour libations on the sacred fire. Without seeking the companionship of other people's wives, the man of wisdom who seeks his own wife in her season acquires the merit of Brahmacharyya. The remnants of a Brahmana's dish are like ambrosia. They are like the lacteal sustenance that is yielded by the mother's breast. People highly prize those remnants. The good, by eating them attain to Brahma. He who pounds turf to clay (for making sacrificial altars), or he who cuts grass (for making sacrificial fuel), or he who uses his nails only (and not weapons of any kind) for eating (sanctified meat), or he who always subsists on the remnants of Brahmana's dishes, or he who acts, induced by desire for reward, has not to live long in the world. One who has abstained from meat (under any vow) should not take meat even if it be sanctified with mantras from the Yajurveda. One should also avoid the flesh about the vertebral column (of any animal) and the flesh of animals not slain in sacrifices. Whether at one's own place or in a strange land, one should never cause one's guest to fast. Having obtained alms and other fruits of optional acts, one should offer them to one's seniors. One should offer seats to one's seniors and salute them with respect.