The works of Ādi Śaṅkarācārya

Bṛhadāraṇyakopaniṣadbhāṣyam

Verse 7

एष ह वा अश्वमेधं क्रतुं वेद य एनमेवं वेद—

In plain words

He truly knows the horse-sacrifice who understands it in this very way—

Close to the Sanskrit

This one indeed knows the horse-sacrifice who thus knows this—