Bhagavad Gita · 18.25

अनुबन्धं क्षयं हिंसामनपेक्ष्य च पौरुषम्।मोहादारभ्यते कर्म यत्तत्तामसमुच्यते॥

anubandhaṁ kṣhayaṁ hiṁsām anapekṣhya cha pauruṣham mohād ārabhyate karma yat tat tāmasam uchyate

Action undertaken out of delusion, without regard for consequences, loss, injury to others, or one's own capacity — that is declared to be tamasic.

— Bhagavad Gita 18.25

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