Bhagavad Gita · 6.37

अर्जुन उवाचअयतिः श्रद्धयोपेतो योगाच्चलितमानसः।अप्राप्य योगसंसिद्धिं कां गतिं कृष्ण गच्छति॥

arjuna uvācha ayatiḥ śhraddhayopeto yogāch chalita-mānasaḥ aprāpya yoga-saṁsiddhiṁ kāṁ gatiṁ kṛṣhṇa gachchhati

Arjuna said: What happens to the person who has faith but lacks self-control — whose mind wanders from yoga — and who fails to attain perfection in yoga? What is their destination, O Krishna?

— Bhagavad Gita 6.37

Source: Sacred-Texts.com (Sanskrit) + Bhagavad-Gita.io (translations)