Subala Upanishad 1.p5

1.p5

oṃ tadāhuḥ kiṃ tadāsīttasmai sa hovāca na sannasanna sadasaditi tasmāttamaḥ sañjāyate tamaso bhūtādirbhūtāderākāśamākāśā-dvāyurvāyragniragnerāpo'dbhyaḥ pṛthivī tadaṇḍaṃ samabhavattatsaṃvatsaramātramuṣitvā dvidhākaro-dadhastādbhūmimupariṣṭādākāśaṃ madhye puruṣo divyaḥ sahasraśīrṣā puruṣaḥ sahasrākṣaḥ sahasrapāt |
sahasrabāhuriti so'gre bhūtānāṃ mṛtyumasṛjantryakṣaraṃ triśiraskaṃ tripādaṃ khaṇḍaparaśuṃ tasya brahmābhidheti sa brahmāṇameva viveśa sa mānasānsapta putrānasṛjatteha virājaḥ satyamānasānasṛjanteha prajāpatayo brāhmaṇo'sya mukhamāsīdbāhū rājanyaḥ kṛtaḥ |
ūrū tadasya yadvaiśyaḥ padbhyāṃ śūdro ajāyata ||

Then he (Raikva) asked: "What was at first?" To which (He the Lord) replied:

"There was neither Saṭ nor asaṭ nor Saṭ-asaṭ. From it, ṭamas (darkness) was evolved. From ṭamas came bhūṭāḍi; from bhūṭāḍi came ākāś, from ākāś, vāyu; from vāyu, agni (fire); from agni, āpas (water); and from āpas, pṛṭhivī (earth). Then it became an egg. After remaining so for one (divine) year, it split into two and became earth below, the ākāś above and in the midst, the infinite Purusha of a divine form of myriads of heads, eyes, feet and hands. Prior to the bhūṭas (elements), he had evolved Mṛṭyu (time or death) of three letters, three heads, and three feet, and having a khaṇda-paraśu (broken axe). To him, Brahma (the Purusha) spoke. He entered Brahma himself and evolved mentally the seven sons and these Havirāts (or sons) as well as the seven prajāpaṭis (progenitors). Brāhmaṇas were born from His mouth, Kshaṭṭriyas from His hands, Vaiśyas from His thighs, and from the feet were born the Śuḍras. The moon was born from His manas (mind), the sun from His eyes, vāyu from (His) ears and prāṇas from (His) heart. Thus all things were born."