Śrīmad-Bhāgavatam · Text 12.6.42
Who is speaking and story frame
तस्य ह्यासंस्त्रयो वर्णा अकाराद्या भृगूद्वह ।
धार्यन्ते यैस्त्रयो भावा गुणनामार्थवृत्तय: ॥ ४२ ॥
tasya hy āsaṁs trayo varṇā
a-kārādyā bhṛgūdvaha
dhāryante yais trayo bhāvā
guṇa-nāmārtha-vṛttayaḥ
Oṁkāra exhibited the three original sounds of the alphabet — A, U and M. These three, O most eminent descendant of Bhṛgu, sustain all the different threefold aspects of material existence, including the three modes of nature, the names of the Ṛg, Yajur and Sāma Vedas, the goals known as the Bhūr, Bhuvar and Svar planetary systems, and the three functional platforms called waking consciousness, sleep and deep sleep.
Read this verse on Vedabase.ioThis verse has no purport; its meaning is explained by the verses around it.
From 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.