BG 1.42
सङ्करो नरकायैव कुलघ्नानां कुलस्य च
पतन्ति पितरो ह्येषां लुप्तपिण्डोदकक्रियाः
saṅkaro narakāyaiva kulaghnānāṃ kulasya ca
patanti pitaro hyeṣāṃ luptapiṇḍodakakriyāḥ
TRANSLATION
This mixing of classes leads to hell the clan itself and its destroyers; for the spirits of their ancestors fall degraded, deprived of the ritual offerings of food and water.