Ahaṃ brahmāsmi, “I am Brahman”, occurs in the Bṛhadāraṇyaka Upaniṣad in an account of how the self, knowing itself, became all. It is counted among the four great sayings of the Upaniṣads. In Advaita it expresses the realized knowledge of identity; the theistic schools read it as the self’s dependence on, or kinship with, God.
Ahaṃ brahmāsmi
“I am Brahman”: one of the great sayings of the Upaniṣads, from the Bṛhadāraṇyaka.
Also: Aham Brahmasmi, I am Brahman