Bhagavad-Gita The Song Divine Chapter 17 (stanza 1-15)

Arjun said: Those endowed with faith, who worship gods and others, disregarding the injunctions of the scriptures, where do they stand, Krishna - in Sattva, Rajas or Tamas? … (1)

Sri Bhagavan said: That untutored innate faith of men is of three kinds - Sattvika, Rajasika and Tamasika. Hear of it from Me.  ……… (2)

The faith of all men conforms to their mental disposition, Arjun, Faith constitutes a man; whatever the nature of his faith, verily he is that. ………………….. (3)

Man of Sattvika disposition worship gods; those of Rajasika temperament worship demigods, the demons; while others, who are of Tamasika disposition, worship the spirits of the dead and ghosts. ……………….. (4)

Men who practice severe penance of an arbitrary type, not sanctioned by the scriptures, and who are full of hypocrisy and egoism and are obsessed  with desire, attachment and pride of power; …………………… (5)

And who emaciate the elements constituting their body as well as Me, the Supreme Spirit, dwelling in their heart- know those senseless people to have a demoniac disposition. ……. (6)

Food also, which is agreeable to different men according to their innate disposition is of three kinds. And, likewise, sacrifice, penance and charity too are of three kinds each; hear their distinction as follows. …………. (7)

foods which promote longevity, intelligence, vigor, health, happiness and cheerfulness, and which are juicy, succulent, substantial and naturally agreeable, are liked by men and Sattvika nature. ………. (8)

Foods which are bitter, sour, salty, over-hot, pungent, dry and burning, and which cause suffering, grief and sickness, are dear to the Rajasika.  …………… (9)

Food which is ill-cooked or not fully ripe, insipid, putrid, stale and polluted, and which is impure too, is dear to men of Tamasika disposition. …………..  (10)

The sacrifice which is offered, as ordained by spiritual injunctions, by men who expect no return and who believe that such sacrifices must be performed, is Sattvika in character. (11)

That sacrifice, however, which is offered for the sake of mere show or even with an eye to its fruit, knows it to be Rajasika, Arjun. ……………….. (12)

A sacrifice, which is not in conformity with scriptural injunctions, in which no food id offered, and no sacrificial fees are paid, which is without sacred chant of hymns and devoid of faith, is said to be Tamasika. ……………… (13)

Worship of gods, the Brahmans, one's guru, elders and great soul, purity, straightforwardness; continence and non-violence - these are called penance of the body. …………….. (14)

Words which cause no annoyance to others and are truthful, agreeable and beneficial, as well as the study of the Vedas and other Sastras and the practice of the chanting of Divine Name - this is known as penance of speech.  ……………. (15)