Mbh 6.41.3b

That sacrifice which is against the ordinance, in which no food is dealt out, which is devoid of mantras (sacred verse), in which no fees are paid to the brahmanas assisting to it, and which is void of faith, is said to be of the quality of darkness. Reverence to the gods, regenerate ones, preceptors, and men of knowledge, purity, uprightness, the practices of a Brahmacharin, and abstention from injury, are said to constitute the penance of the body. The speech which causeth no agitation, which is true, which is agreeable and beneficial, and the diligent study of the Vedas, are said to be the penance of speech. Serenity of the mind, gentleness, taciturnity, self-restraint, and purity of the disposition,--these are said to be the penance of the mind. This three-fold penance performed with perfect faith, by men without desire of fruit, and with devotion, is said to be of the quality of goodness. That penance which is performed for the sake of (gaining) respect, honour, and reverence, with hypocrisy, (and) which is unstable and transient is said to be of the quality of passion. That penance which is performed under a deluded conviction, with torture of one’s self, and for the destruction of another, is said to be of the quality of darkness. That gift which is given because it ought to be given, to one who cannot return any service for it, in a proper time, and to a proper person, is said to be of the quality of goodness. That, however, which is given reluctantly, for return of services (past or expected), or even with an eye to fruit,--that gift is said to be of the quality of passion. In an unfit place and at an unfit time, the gift that is made to an unworthy object, without respect, and with contempt, is said to be of the quality of darkness. OM, TAT, SAT, this is said to be the three-fold designation of Brahma. By that (Brahma), the Brahmanas and the Vedas, and the Sacrifices, were ordained of old.