Bhagavad Gita · 1.44

अहो बत महत्पापं कर्तुं व्यवसिता वयम्।यद्राज्यसुखलोभेन हन्तुं स्वजनमुद्यताः॥

aho bata mahat pāpaṁ kartuṁ vyavasitā vayam yad rājya-sukha-lobhena hantuṁ sva-janam udyatāḥ

Alas, what a great sin we have resolved to commit — driven by greed for royal pleasures, we are prepared to kill our own kinsmen.

— Bhagavad Gita 1.44

Source: Sacred-Texts.com (Sanskrit) + Bhagavad-Gita.io (translations)