Kena (Talavakāra) Upaniṣad 1.9

1.9

yat prāṇena na prāṇiti
yena prāṇaḥ praṇīyate
tad eva brahma tvaṃ viddhi
nedaṃ yad idam upāsate

8. That which one breathes (_prāṇiti_) not with breathing (_prāṇa_, breath),
[or, That which breathes not with breath,]
That with which breathing (_prāṇa_) is conducted (_praṇīyate_)—
That indeed know as Brahma,
Not this that people worship as this.