Srimad-Bhagavatam: Canto 10 - Chapter 1 - Verse 56

Sanskrit:

तस्माद्विसृज्याशिष ईश सर्वतोरजस्तम:सत्त्वगुणानुबन्धना: ।निरञ्जनं निर्गुणमद्वयं परंत्वां ज्ञाप्तिमात्रं पुरुषं व्रजाम्यहम् ॥ ५६ ॥

ITRANS:

tasmād visṛjyāśiṣa īśa sarvatorajas-tamaḥ-sattva-guṇānubandhanāḥnirañjanaṁ nirguṇam advayaṁ paraṁtvāṁ jñāpti-mātraṁ puruṣaṁ vrajāmy aham

Translation:

Therefore, O Lord, having put aside all objects of material desire, which are bound to the modes of passion, ignorance and goodness, I am approaching You, the Supreme Personality of Godhead, for shelter. You are not covered by mundane designations; rather, You are the Supreme Absolute Truth, full in pure knowledge and transcendental to the material modes.

Purport:

The word nirguṇam here indicates that the Lord’s existence is beyond the qualities of material nature. One might argue that Lord Kṛṣṇa’s body is made of material nature, but here the word advayam refutes that argument. There is no duality in Lord Kṛṣṇa’s existence. His eternal, spiritual body is Kṛṣṇa, and Kṛṣṇa is God.