Śrīmad-Bhāgavatam · Text 10.85.9
Who is speaking and story frame
दिशां त्वमवकाशोऽसि दिश: खं स्फोट आश्रय: ।
नादो वर्णस्त्वम् ॐकार आकृतीनां पृथक्कृति: ॥ ९ ॥
diśāṁ tvam avakāśo ’si
diśaḥ khaṁ sphoṭa āśrayaḥ
nādo varṇas tvam oṁkāra
ākṛtīnāṁ pṛthak-kṛtiḥ
You are the directions and their accommodating capacity, the all-pervading ether and the elemental sound residing within it. You are the primeval, unmanifested form of sound; the first syllable, om; and audible speech, by which sound, as words, acquires particular references.
Read the purport on Vedabase.ioFrom Canto 10, chapter 14 onward, the translation and purports were completed by Śrīla Prabhupāda's disciples after his departure, and published by the Bhaktivedanta Book Trust.