Bhagavad Gita 3.32 Chapter 3, Verse 32

ये त्वेतदभ्यसूयन्तो नानुतिष्ठन्ति मे मतम् ।
सर्वज्ञानविमूढांस्तान्विद्धि नष्टानचेतसः ॥३.३२॥

ye tvetadabhyasūyanto nānutiṣṭhanti me matam
sarvajñānavimūḍhāṃstānviddhi naṣṭānacetasaḥ

Meaning

But know that those who find fault and do not follow my teaching are deluded in all knowledge, lacking discernment, and lost.

Newly written by Bhajan Dhun — scholarly review in progress.

Reference: Bhagavad Gita 3.32 (Chapter 3, The Yoga of Action (Karma Yoga), Verse 32)