Verse
यस्मात्क्षरमतीतोऽहम् अक्षरादपि चोत्तमः ।अतोऽस्मि लोके वेदेच प्रथितः पुरुषोत्तमः ॥
Since I am beyond the mutable and am greater and higher even than the immutable, in the world and the Veda I am proclaimed as the Purushottama (the supreme Self).
Gītā 15·18