The works of Ādi Śaṅkarācārya

Chāndogyopaniṣadbhāṣyam

Verse 94

पृथिवी हिङ्कारोऽन्तरिक्ष प्रस्तावो द्यौ-रुद्गीथो दिशः प्रतिहारः समुद्रो निधनमे-ताः शकर्यो लोकेषु प्रोताः ॥ १ ॥

In plain words

The earth is the hiṅkāra chant, the atmosphere is the prastāva, the sky is the udgītha, the quarters are the pratihāra, and the ocean is the nidhana. These śakarī verses are woven throughout the worlds.

Close to the Sanskrit

The earth is the hiṅkāra, the atmosphere is the prastāva, the sky is the udgītha, the directions are the pratihāra, the ocean is the nidhana; these śakarī verses are woven in the worlds.