It has been heard, O Arjuna, that, without slaying one's enemies one incurs sin. The duty of a Kshatriya is to stay or to be slain.
अथावधश्च शूत्रणामधर्मः श्रूयतेऽर्जुन। क्षत्रियस्य हि धर्मोऽयं हन्याद्धन्येत वा पुनः॥