BG 2.33

अथ चेत्त्वमिमं धर्म्यं संग्रामं न करिष्यसि। ततः स्वधर्मं कीर्तिं च हित्वा पापमवाप्स्यसि॥

atha cet tvam imaṃ dharmyaṃ saṃgrāmaṃ na kariṣyasi / tataḥ svadharmam kīrtiṃ ca hitvā pāpam avāpsyasi

"If you don't fight this righteous battle, you abandon your duty and honor — and invite the consequences."

All public-domain translations

3 translations · all pre-1928 or released to public domain · sources

Swami Swarupananda, Srimad Bhagavad Gita (1909)

But if you do not fight this righteous war, then, having abandoned your own duty and fame, you shall incur sin.

But if thou shunn'st this duty of thy birth, this fair fight — setting aside all duty and honor — thou shall take sin on thee.

But if you do not fight this righteous battle, then abandoning your own duty and fame, you will incur sin.