Vishnupurana 3.15.12

3.15.12

tasmātprathamamatroktaṃ dvijāgryāṇāṃ nimantraṇam /
animantrya dvijānevamāgatānbho jayedyatīn //

"A false friend, a man with ugly nails or black teeth, a ravisher, a Brahman who neglects the service of fire and sacred study, a vender of the Soma plant, a man accused of any crime, a thief, a calumniator, a Brahman who conducts religious ceremonies for the vulgar; one who instructs his servant in holy writ, or is instructed in it by his servant; the husband of a woman who has been formerly betrothed to another; a man who is undutiful to his parents; the protector of the husband of a woman of the servile caste, or the husband of a woman of the servile caste; and a Brahman who ministers to idols--are not proper persons to be invited to au ancestral offering. On the first day let a judicious man invite eminent teachers of the Vedas, and other Brahmans; and according to their directions determine what is to be dedicated to the gods, and what to the Pitris. Associated with the Brahmans, let the institutor of an obsequial rite abstain from anger and incontinence. He who having eaten himself in a Śráddha, and fed Brahmans, and appointed them to their sacred offices, is guilty of incontinence, thereby sentences his progenitors to shameful suffering. In the first place, the Brahmans before described are to be invited; but those holy men who come to the house without an invitation are also to be entertained. The guests are to be reverently received with water for their feet, and the like; and the entertainer, holding holy grass in his hand, is to place them, after they have rinsed their mouths, upon seats. An uneven number of Brahmans is to be invited in sacrifices to the manes; an even or uneven number in those presented to the gods; or one only on each occasion.