Shiva Purana
उत्पत्तिं विलयं चैव यथात्म्यं च षडध्वनाम् ॥ ततः परतरं धाम धामवंतं च पूरुषम् ॥ ५६ ॥
The origin and dissolution of the six sounds are also explained in detail. Then there is the supreme abode and the abode-bearing Purusha.
english translation
utpattiM vilayaM caiva yathAtmyaM ca SaDadhvanAm ॥ tataH parataraM dhAma dhAmavaMtaM ca pUruSam ॥ 56 ॥
hk transliteration by Sanscript