One verse

Bhagavad Gita 3.32

3.32

ये त्वेतदभ्यसूयन्तो नानुतिष्ठन्ति मे मतम् | सर्वज्ञानविमूढांस्तान्विद्धि नष्टानचेतसः ||३-३२||

ye tvetadabhyasūyanto nānutiṣṭhanti me matam . sarvajñānavimūḍhāṃstānviddhi naṣṭānacetasaḥ ||3-32||

ye
those
etat
this
abhyasūyantaḥ
out of envy
na
do not
anutiṣṭhanti
regularly perform
me
My
matam
injunction
sarva-jñāna
in all sorts of knowledge
vimūḍhān
perfectly befooled
tān
they are
viddhi
know it well
naṣṭān
all ruined
acetasaḥ
without Kṛṣṇa consciousness

But those who, out of envy, disregard these teachings and do not follow them regularly are to be considered bereft of all knowledge, befooled, and ruined in their endeavors for perfection.