Muṇḍaka Upaniṣad 1.2.6

1.2.6

ehy ehīti tam āhutayaḥ suvarcasaḥ sūryasya raśmibhir yajamānaṃ vahanti.
priyāṃ vācam abhivadantyo 'rcayantya eṣa vaḥ puṇyaḥ sukṛto brahmalokaḥ.

6. Saying to him "Come! Come!" the splendid offerings
Carry the sacrificer with the rays of the sun,
Addressing pleasant speech, praising, and saying:
"This is your meritorious (puṇya) Brahma-world, gained by good works."