Bhagavad Gita · 11.18

त्वमक्षरं परमं वेदितव्यंत्वमस्य विश्वस्य परं निधानम्।त्वमव्ययः शाश्वतधर्मगोप्तासनातनस्त्वं पुरुषो मतो मे॥

tvam akṣharaṁ paramaṁ veditavyaṁ tvam asya viśhvasya paraṁ nidhānam tvam avyayaḥ śhāśhvata-dharma-goptā sanātanas tvaṁ puruṣho mato me

You are the imperishable, the supreme to be known. You are the ultimate resting place of the universe. You are the protector of eternal dharma. I believe you are the eternal Supreme Being.

— Bhagavad Gita 11.18

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