Chapter 3 · The Yoga of Action · Krishna said
Bhagavad Gita 3.32 — Those who reject it
ये त्वेतदभ्यसूयन्तो नानुतिष्ठन्ति मे मतम्। सर्वज्ञानविमूढांस्तान्विद्धि नष्टानचेतसः ॥
ye tvetadabhyasūyanto nānutiṣṭhanti me matam | sarvajñānavimūḍhāṃstānviddhi naṣṭānacetasaḥ ||
Meaning
But those who find fault with this teaching and do not follow it, confused about all knowledge, know them to be lost and without understanding.