Chāndogya Upaniṣad 1.13.1

1.13.1

ayaṃ vāva loko hāükāraḥ \
vāyur hāïkāraḥ \
candramā athakāraḥ \
ātmehakāraḥ \
agnir īkāraḥ \\113.1\

1. Verily, the sound hā-u is the world, [for this interjectional trill occurs in the Rathantara Sāman, which is identified with the earth].

The sound hā-i is wind, [for this interjectional trill occurs in the Vāmadevya Sāman, which has for its subject the origin of wind and water].

The sound atha is the moon, [for on food (anna) everything is established (sthita), and the moon consists of food].

The sound iha is oneself, [for oneself is here (iha)].

The sound ī is Agni, [for all Sāmans sacred to Agni end with the sound ī].