Bhagavad Gita · 11.38

त्वमादिदेवः पुरुषः पुराण-स्त्वमस्य विश्वस्य परं निधानम्।वेत्तासि वेद्यं च परं च धामत्वया ततं विश्वमनन्तरूप॥

tvam ādi-devaḥ puruṣhaḥ purāṇas tvam asya viśhvasya paraṁ nidhānam vettāsi vedyaṁ cha paraṁ cha dhāma tvayā tataṁ viśhvam ananta-rūpa

You are the primeval God, the ancient Being. You are the supreme resting place of the universe. You are the knower and that which is to be known. You are the supreme abode. The universe is pervaded by you, O infinite form.

— Bhagavad Gita 11.38

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