Bhagavad Gita 1.44
उत्सन्नकुलधर्माणां मनुष्याणां जनार्दन। नरके नियतं वासो भवतीत्यनुशुश्रुम।।1.44।।
utsannakuladharmāṇāṃ manuṣyāṇāṃ janārdana| narake niyataṃ vāso bhavatītyanuśuśruma||1.44||
utsannakuladharmanam manushyanam janardana narake niyatam vaso bhavatityanushushruma1.44
Meaning
Arjuna states that he has heard from the scriptures that those whose family dharma is destroyed are destined to dwell in hell for an indefinite period.
हे जनार्दन! जिन मनुष्यों के कुलधर्म नष्ट हो जाते हैं, उनका नरक में नित्य वास होता है — यह हमने सुना है।
This is verse 44 of 47 in Chapter 1 (Arjuna Vishada Yoga) of the Bhagavad Gita.