Purification of Riches

“In the material world we possess riches and wealth in many ways, but sometimes not in very honest and pious ways, because that is the nature of accumulating wealth. According to Vedic injunction, therefore, such wealth should be purified by giving cows and gold in charity to the brahmanas.” (Shrila Prabhupada, Krishna, The Supreme Personality of Godhead, Vol 1, Ch 5)