Bhagavad Gita 15.18
I am beyond comparison with the Eternal and the non-eternal; I am known as the Supreme Personality, the Highest God, by scriptures and sages.
यस्मात्क्षरमतीतोऽहमक्षरादपि चोत्तमः।अतोऽस्मि लोके वेदे च प्रथितः पुरुषोत्तमः॥yasmātkṣaramatīto'hamakṣarādapi cottamaḥ|ato'smi loke vede ca prathitaḥ puruṣottamaḥ||
English translation (above): Shri Purohit Swami (1935), public domain. Sanskrit text via github.com/gita/gita (Unlicense).