The works of Ādi Śaṅkarācārya

Chāndogyopaniṣadbhāṣyam

Verse 139

त एतदेव रूपमभिसंविशन्त्येतस्मा-द्रूपादुद्यन्ति ॥ २ ॥

In plain words

They merge directly into that form, and rise up from it once more.

Close to the Sanskrit

They enter into this very form, and rise up from this form.