Bhagavad Gita · Chapter 1: Arjuna's Despair

Bhagavad Gita 1.44

utsannakuladharmāṇāṃ manuṣyāṇāṃ janārdana | narake'niyataṃ vāso bhavatītyanuśuśruma ||

We have heard it said, Krishna, that people whose family traditions are destroyed dwell in hell for an indefinite time.

Modern context

'So we have heard.' Arjuna's last support is received opinion, not something he knows for himself. What we have been told is a fair place to start, but in a real crisis borrowed certainty does not hold. He will need to understand for himself, and that is what he goes on to ask for.