śrotrākāśayoḥ saṃbandhasaṃyamād divyaṃ śrotram [YS 3.41]

sarvaśrotrāṇām ākāśaṃ pratiṣṭhā sarvaśabdānāṃ ca yathoktam --- tulyadeśaśravaṇānām ekadeśaśrutitvaṃ sarveṣāṃ bhavatīti tac caitad ākāśasya liṅgam.

anāvaraṇaṃ coktam. tathāmūrtasyānāvaraṇadarśanād vibhutvam api prakhyātam ākāśasya. śabdagrahaṇānumitaṃ śrotram. badhirābadhirayor ekaḥ śabdaṃ gṛhṇāty aparo na gṛhṇātīti tasmāc chrotram eva śabdaviṣayam śrotrākāśayoḥ saṃbandhe kṛtasaṃyamasya yogino divyaṃ śrotraṃ pravartate.