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ये त्वेतदभ्यसूयन्तो नानुतिष्ठन्ति मे मतम् ।
सर्वज्ञानविमूढांस्तान्विद्धि नष्टानचेतसः ॥३- ३२॥

ye twetadabhyasooyanto naanutiShThanti me matam ।

sarwadnyaanawimooDhaaMstaanwiddhi naShTaanachetasaH ॥३- ३२॥

Source: Automatic ITRANS Transliteration

But for those who spitefully waver in My belief:
Know those fully ignorant fools to be doomed unaware.

But know those fully ignorant fools to be doomed, unaware, who spitefully waver in this my belief.

Source: Milind S. Pandit

But, those who carp at My teaching and do not practice it, consider them as ignorant of all knowledge, senseless, and lost.

Source: The Bhagavad-Gita: The Sacred Song

But those who, out of envy, disregard these teachings and do not practice them regularly, are to be considered bereft of all knowledge, befooled, and doomed to ignorance and bondage.

Source: Bhagavad Gita As It Is