Aśauca-vidhi (Rules of Impurity) within Śrāddha-kalpa — Chapter on Testing/Selecting Brahmanas and Honoring the Atithi
स्तेनश्च सर्वयाजी च सर्वे ते पङ्क्तिदूषकाः / यश्च सूकरवद्भुङ्क्ते यश्च पाणितले द्विजः
stenaśca sarvayājī ca sarve te paṅktidūṣakāḥ / yaśca sūkaravadbhuṅkte yaśca pāṇitale dvijaḥ
A thief, and one who performs sacrifices for just anyone—such men all defile the dining row. So too one who eats like a swine, and the dvija who eats from his palm.