Muṇḍaka Upaniṣad 1.2.5

1.2.5

eteṣu yaś carate bhrājamāneṣu yathākālaṃ cāhutayo hy ādadāyan.
taṃ nayanty etāḥ sūryasya raśmayo yatra devānāṃ patir eko 'dhivāsaḥ.

5. If one performs sacrifices when these are shining,
Offering the oblations at the proper time, too,
These (flames) as rays of the sun lead him
To where is resident the one lord (pati) of the gods.