The works of Ādi Śaṅkarācārya

Chāndogyopaniṣadbhāṣyam

Verse 127

त एतदेव रूपमभिसंविशन्त्येतस्माद्रूपादुद्यन्ति ॥ २ ॥

In plain words

They merge completely into this very form, and they rise up forth from this same form.

Close to the Sanskrit

They enter completely into this very form; they rise up from this form.