The works of Ādi Śaṅkarācārya

Chāndogyopaniṣadbhāṣyam

Verse 15

तेन त५ हायास्य उद्गीथमुपासाञ्चक्रएतमु एवायास्यं मन्यन्त आस्याद्यदते ॥

In plain words

By that very means Ayasya worshipped the Udgitha. People consider him alone to be Ayasya, because he moves forth from the mouth.

Close to the Sanskrit

By that indeed Ayasya worshipped the Udgitha. They think this very one to be Ayasya, because it goes forth from the mouth.