Jaiminīya Upaniṣad Brāhmaṇa 2.7.6

2.7.6

atha hovāca bambam ājadviṣam yan me tvam udgāyeḥ kiṃ tatas syād iti /

Then he said to Bamba Ājadviṣa: “If you were to chant for me, what would result from it?”