Bhagavad Gita · Chapter 1: Arjuna's Despair

Bhagavad Gita 1.42

saṅkaro narakāyaiva kulaghnānāṃ kulasya ca | patanti pitaro hyeṣāṃ luptapiṇḍodakakriyāḥ ||

Such mixing leads to hell both the family and those who destroyed it. Their ancestors fall too, deprived of the offerings of rice and water.

Modern context

Behind the ritual language is a human fear: that the dead will be forgotten, with no one left to remember them or do anything in their name. Each generation is the keeper of the memory of those before it.