Bhagavad Gita · 15.17

उत्तमः पुरुषस्त्वन्यः परमात्मेत्युदाहृतः।यो लोकत्रयमाविश्य बिभर्त्यव्यय ईश्वरः॥

uttamaḥ puruṣhas tv anyaḥ paramātmety udāhṛtaḥ yo loka-trayam āviśhya bibharty avyaya īśhvaraḥ

But there is another, the Supreme Person, called the Supreme Self, the imperishable Lord who pervades and sustains the three worlds.

— Bhagavad Gita 15.17

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