The works of Ādi Śaṅkarācārya

Muṇḍakopaniṣadbhāṣyam

Avatarika

Avatarika

पञ्चाग्निद्वारेण च या ससरन्ति प्रजा , ता अपि तस्मादेवपुरुषात्प्रजायन्त इत्युच्यते—

In plain words

And those creatures that travel the path of the five fires also originate from that very Purusha—so it is declared.

Close to the Sanskrit

And which creatures move through the door of the five fires, those also are born from that very Purusha, thus it is said—