Jaiminīya Upaniṣad Brāhmaṇa 2.7.8

2.7.8

atha hovācośanasaṃ kāvyaṃ yan me tvam udgāyeḥ kiṃ tatas syād iti /

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