सङ्करो नरकायैव कुलघ्नानां कुलस्य च ।पतन्ति पितरो ह्येषां लुप्तपिण्डोदकक्रियाः ॥
saṅkaro narakāyaiva kulaghnānāṃ kulasya ca |patanti pitaro hyeṣāṃ luptapiṇḍodakakriyāḥ ||
This mixing leads only to hell, for the family and for those who destroy it. Their ancestors fall too, as the offerings of rice-balls and water are cut off.
Explanation
Arjuna continues his argument against fighting his own relatives. He says that the confusion of social classes (varṇa-saṅkara) would harm both the family and its destroyers, and would also harm the ancestors, who depend on the rites of offering rice-balls (piṇḍa) and water (udaka). In Arjuna's view, when these duties lapse, the ancestors lose their standing.