Mbh 13.104.2b

Even those men live for a hundred years who, though destitute of all accomplishments, betake themselves to propriety and righteousness of conduct and become endued with faith and freed from malice. He that is free from wrath, that is truthful in speech, that never does any injury to any creature in the universe, that is divested of malice and crookedness and insincerity, succeeds in living for a hundred years. He who always breaks little clods of earth, or tears up the grass that grows under his feet, or cuts off his nails with his teeth, or is always impure, or very restless, never succeeds in acquiring a long life.[458] One should wake up from sleep at the hour known as the Brahma Muhurta and then think of both religion and profit. Getting up from bed, one should then wash one's face and mouth, and joining one's hands in an attitude of reverence, say the morning prayers.[459] In this way, one should when evening comes, say one's evening prayers also, restraining speech (with other people) the while. One should never look at the rising sun, nor at the setting sun.[460] Nor should one look at the sun when he is in eclipse; nor at his image in the water; nor at midday when he is at the meridian. The Rishis, in consequence of their adoring the two twilights with great regularity succeeded in attaining to longevity. Hence, one should, restraining speech, say one's prayers regularly at the two twilights. As regards those Brahmanas that do not say their prayers at the two twilights, a righteous king should set them to accomplish such acts as are ordained for the Sudras. Persons of every order should never have sexual congress with other people's wives. There is nothing that shortens life so effectually as sexual congress with other people's wives. For as many thousand years shall the adulterer have to live in Hell as the number of pores on the bodies of the women with whom he may commit the offence.