Here is the Sanskrit anuvad, Hindi anuvad, and English translation of Sankhya Yoga Chapter 2, Verse 2.33.
Sanskrit
अथ चेत्त्वमिमं धर्म्यं संग्रामं न करिष्यसि । ततः स्वधर्मं कीर्तिं च हित्वा पापमवाप्स्यसि ॥ २.३३ ॥
Hindi
किन्तु यदि तू इस धर्मयुक्त युद्धको नहीं करेगा तू तो स्वधर्म और कीर्तिको खोकर पापको प्राप्त होगा|
English
By not fighting this war, O ARJUNA, you are committing a sin because you fail to perform your duty as a warrior and you also will lose your honour.