Jaiminīya Upaniṣad Brāhmaṇa 1.45.1

1.45.1

tad dha pṛthur vainyo divyān vrātyān papracche-
-indram uktham ṛcam udgītham āhur brahma sāma prāṇaṃ vyānam
mano vā cakṣur apānam āhuś śrotraṃ śrotriyā bahudhā vadantīti /

Then Pṛthu Vainya asked the divine Vrātyas:
'They call Indra the uktha, the ṛc, the udgītha, brahman, the sāman, breath, out-breath;
or mind, sight, down-breath do they call [him], hearing—the learned theologians speak of him in many ways.'