Shanti Parva 243.8

He should always adore such guests who present sacrificial offerings, who are cleansed by Vedic learning, who observe excellent vows, who are high-born and conversant with the scriptures, who are self-controlled, mindful of all religious acts, and devoted to penances. The scriptures hold that what is offered to the gods and the departed manes in sacrifices and religious rites, is meant for the service of guests like these.