he is the inmost self

"When a man is dying, his family
All gather round and ask, 'Do you know me?
Do you know me?' And so long as his speech
Has not merged in mind, his mind in prana,
Prana in fire, and fire in pure Being,
He knows them all. But there is no more knowing.
When speech merges in mind, mind in prana,
Prana in fire, and fire in pure Being.
There is nothing that does not come from him.
Of everything he is the inmost Self.
He is the truth; he is the Self supreme.
You are that, Shvetaketu; you are that."

-Chandogya Upanishad