Aśauca-vidhi (Rules of Impurity) within Śrāddha-kalpa — Chapter on Testing/Selecting Brahmanas and Honoring the Atithi
कारुकादीननाचारांल्लोकवेदबहिष्कृतान् / गाय नान्वेदवृत्तांश्च हव्यकव्ये न भोजयेत्
kārukādīnanācārāṃllokavedabahiṣkṛtān / gāya nānvedavṛttāṃśca havyakavye na bhojayet
Artisans, those of bad conduct, those ostracized from society and the Vedas, and professional singers—one should not feed them in rites for gods or ancestors.