Bhagavadgita 2.131

Bhagavadgītābhāṣya (Śāṅkarabhāṣya) 2.131

atha cet tvam imaṃ dharmyaṃ saṃgrāmaṃ na kariṣyasi |
tataḥ sva-dharmaṃ kīrtiṃ ca hitvā pāpam avāpsyasi ||