Bhagavad Gita · 9.3

अश्रद्दधानाः पुरुषा धर्मस्यास्य परन्तप।अप्राप्य मां निवर्तन्ते मृत्युसंसारवर्त्मनि॥

aśhraddadhānāḥ puruṣhā dharmasyāsya parantapa aprāpya māṁ nivartante mṛtyu-saṁsāra-vartmani

Those who have no faith in this dharma, O scorcher of foes, fail to attain Me and return to the path of death and rebirth in this material world.

— Bhagavad Gita 9.3

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