Chapter 18 · verse 31 · gita.yoga.org

Bhagavad Gita 18.31

यया धर्ममधर्मं च कार्यं चाकार्यमेव च।अयथावत्प्रजानाति बुद्धिः सा पार्थ राजसी

That by which one wrongly understands dharma and adharma, and also what ought to be done and what ought not to be done—that intellect, O Arjuna, is rajasic (passionate).