Bhagavad Gita · 10.7

एतां विभूतिं योगं च मम यो वेत्ति तत्त्वतः।सोऽविकम्पेन योगेन युज्यते नात्र संशयः॥

etāṁ vibhūtiṁ yogaṁ cha mama yo vetti tattvataḥ so 'vikampena yogena yujyate nātra sanśhayaḥ

One who truly knows my divine glories and mystic power becomes united with me through unwavering yoga. Of this there is no doubt.

— Bhagavad Gita 10.7

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