Shloka 44
प्रतिग्रहभेदः — The Distinction between Giving and Accepting
Vṛṣādarbhī–Saptarṣi Dialogue
संकीर्णयोनिर्विप्रश्न॒ सम्बन्धी पतितश्न यः । वर्जनीया बुधैरेते निवापे समुपस्थिते
saṅkīrṇayonir vipraśna-sambandhī patitaś ca yaḥ | varjanīyā budhair ete nivāpe samupasthite ||
ビーシュマは言った。「混淆した、あるいは正規ならぬ出生の者、vipraśna（婆羅門の秩序を犯し、または乱す者）に連なる親族、そして正しい行いから堕ちた者——これらは、シュラーダの供献（nivāpa／piṇḍadāna）の時が来れば、賢者によって排除されるべきである。」
भीष्म उवाच
Educational Q&A
That śrāddha (ancestral offering) should be conducted with careful attention to ritual boundaries; those classified as ritually fallen or socially/ritually disruptive are to be kept away at the time of the offering.
In Anuśāsana Parva, Bhīṣma instructs Yudhiṣṭhira on dharma, including detailed conduct for śrāddha. Here he lists categories of persons whom the learned tradition considers to be excluded when the nivāpa/piṇḍa offering is about to be made.