Mbh 13.136.2a

"'Bhishma said, "I shall tell thee, O prince, how high-souled Brahmanas may be absolved from all sin incurred by accepting food from others. In accepting clarified butter, the expiation is made by pouring oblations on the fire, reciting the Savitri hymn. In accepting sesamum, O Yudhishthira, the same expiation has to be made. In accepting meat, or honey, or salt, a Brahmana becomes purified by standing till the rising of the sun. If a Brahmana accepts gold from any one, he becomes cleansed of all sins by silently reciting the great Vedic prayer (Gayatri) and by holding a piece of iron in his hand in the presence of the public. In accepting money or clothes or women or gold, the purification is the same as before. In accepting food, or rice boiled in milk and sugar, or sugarcane juice, or sugar-cane, or oil, or any sacred thing, one becomes purified by bathing thrice in the course of the day, viz., at morn, noon and eve. If one accepts paddy, flowers, fruits, water, half-ripe barley, milk, or curdled milk, or anything made of meal or flour, the expiation is made by reciting the Gayatri prayer a hundred times. In accepting shoes or clothes at obsequial ceremonies, the sin is destroyed by reciting devoutly the same hymn a hundred times. The acceptance of the gift of land at the time of an eclipse or during the period of impurity, is expiated by observing a fast during three successive nights. The Brahmana who partakes of oblations offered to deceased ancestors, in course of the dark fortnight, is purified by fasting for a whole day and night. Without performing his ablutions a Brahmana should not say his evening prayers, nor betake himself to religious meditation, nor take his food a second time. By so doing he is purified. For this reason, the Sraddha of deceased ancestors has been ordained to be performed in the afternoon and then the Brahmana who has been invited beforehand should be feasted.