Mahabharata Santi Parva Chapter 293:2

Mahabharata Santi Parva (Mokshadharma Parva) Chapter 293:2 That wealth which is earned by righteous ways is true wealth. Fie on that wealth, however, which is earned by unrighteous means. Righteousness is eternal. It should never, in this world, be abandoned from desire of wealth. That righteous-souled person who keeps his sacred fire and offers his daily adorations to the deities is regarded as the foremost of righteous persons. All the Vedas, O foremost of kings, are established on the three sacred fires (called Dakshina, Garhapatya, and Ahavaniya). That Brahmana is said to possess the sacred fire whose acts exist in their entirety. It is better to at once abandon the sacred fire than to keep it, abstaining the while from acts. The sacred fire, the mother, the father who has begotten, and the preceptor, O tiger among men, should all be duly waited upon and served with humility. That man who, casting off all feelings of pride, humbly waits upon and serves them that are venerable for age, who is possessed of learning and destitute of lust, who looketh upon all creatures with an eye of love, who has no wealth, who is righteous in his acts, and who is destitute of the desire of inflicting any kind of harm (upon any one), that truly respectable man is worshipped in this world by those that are good and pious.'