Bhagavad Gita Chapter 11, Verse 38

त्वमादिदेवः पुरुषः पुराणस्त्वमस्य विश्वस्य परं निधानम् | वेत्तासि वेद्यं च परं च धाम त्वया ततं विश्वमनन्तरूप ||

tvam ādi-devaḥ puruṣaḥ purāṇas tvam asya viśvasya paraṁ nidhānam vettāsi vedyam ca paraṁ ca dhāma tvayā tataṁ viśvam ananta-rūpa

You are the original god, the ancient Supreme Person, the supreme resting place of this universe. You are the knower, that which is to be known, and the supreme abode. By You the universe is pervaded, O infinite form.

Arjuna continues praising Krishna, recognizing him as the origin and essence of everything. 'Tvam ādi-devaḥ puruṣaḥ purāṇaḥ'—You (tvam) are the original god (ādi-devaḥ), the ancient (purāṇaḥ) Supreme Person (puruṣaḥ). 'Tvam asya viśvasya paraṁ nidhānam'—You are the supreme resting place (paraṁ nidhānam) of this universe (asya viśvasya). 'Vettāsi vedyam ca paraṁ ca dhāma'—You are (asi) the knower (vettā), that which is to be known (vedyam), and (ca) the supreme (paraṁ) abode (dhāma). 'Tvayā tataṁ viśvam ananta-rūpa'—by You (tvayā), the universe (viśvam) is pervaded (tatam), O infinite form (ananta-rūpa). Arjuna recognizes Krishna as the origin, the knower, the known, and the abode—everything is contained within Krishna, and everything is pervaded by him. This verse shows Arjuna's understanding reaching its peak: Krishna is the origin, essence, and destination of everything.