The works of Ādi Śaṅkarācārya

Bṛhadāraṇyakopaniṣadbhāṣyam

Avatarika

Avatarika

पञ्चमेऽङ्गे सप्रणवतां विधातुमाह—

In plain words

Now, to show that this fifth limb also carries Om within it, the text goes on:

Close to the Sanskrit

In order to establish that the fifth limb too is joined with the praṇava, he says—