Chapter 1 · verse 40 · gita.yoga.org

Bhagavad Gita 1.40

कुलक्षये प्रणश्यन्ति कुलधर्माः सनातनाः। धर्मे नष्टे कुलं कृत्स्नमधर्मोऽभिभवत्युत

In the destruction of a family, the immemorial religious rites of that family perish; on the destruction of spirituality, impiety indeed, overwhelms the whole family.