The works of Ādi Śaṅkarācārya

Bṛhadāraṇyakopaniṣadbhāṣyam

Verse 51

तस्यै वाचः पृथिवी शरीरं ज्योतीरू-

In plain words

Of that speech, the earth is the physical basis, and the luminous form...

Close to the Sanskrit

Of that speech, the earth is the body, the luminous form...