Muṇḍaka Upaniṣad 2.1.6

2.1.6

tasmād ṛcaḥ sāma yajūṃṣi dīkṣā yajñāś ca sarve kratavo dakṣiṇāś ca.
saṃvatsaraś ca yajamānaś ca lokāḥ somo yatra pavate yatra sūryaḥ.

6. From Him the Ṛig Verses, the Sāman Chant, the sacrificial formulas (yajus), the initiation rite (dīkṣā). And all the sacrifices, ceremonies, and sacrificial gifts (_dakṣiṇā_), The year too, and the sacrificer, the worlds Where the moon (Soma) shines brightly, and where the sun.