Jaiminīya Upaniṣad Brāhmaṇa 3.4.12

3.4.12

yad imam āhur ekastoma ity ayam eva yo 'yam pavate
eṣo 'dhidevatam
prāṇo 'dhyātmam
tasya śarīram anucaraḥ /

What they call this one single-stoma (ekastoma) is this one who purifies here [the wind].
This is pertaining to the deities.
Breath is pertaining to the self.
His body is the follower.