Manava Dharmashastra 3.166

3.166

paṅktimarhantīti paṃktyāḥ | sadbhirekatrāsanabhojanādyarhatā ‘paṃktyatā’, tadabhāvādapaṃktyaḥ | sa yāvataḥ paṃktyānvirūttapasviśrotriyān bhuñjānānanupaśyati, tāvatāṃ na tatra pitṛptyākhyaṃ phalaṃ bhavati | ataḥ stenādayaḥ śrāddhaṃ kurvatā tataḥ pradeśādapasāraṇīyāḥ | bāliśo mūrkhaḥ |

Medhātithi’s commentary (manubhāṣya):
‘Pāṅktya’ are those that deserve the paṅkti, line. One is called ‘pāṅktya’ when one is deserving of sitting on the same seat as, and eating in the company of, good men. He who is not so deserving, is ‘a-pāṅktya.’

As many worthy people—learned men, ascetics and persons learned in the Veda—the unworthy man happens to look upon while the former are eating,—the reward of feeding so many men,—in the shape of the satisfaction of his ancestors—fails to be accomplished.

For this reason, when one is performing śrāddhas, one should send away from that place all thieves and others.

‘Foolish’—ignorant.—(176)