Subala Upanishad of Shukla-yajurveda, Chapter XV

Again Raikva asked: "O Lord, when this Vijñāna-ghana goes out (of the body or the universe), what does it burn and how?" To which He replied: "When it goes away, it burns prāṇa, apāna, vyāna, udāna, samāna, vairambha, mukhya, antaryāma, prabhañjana, kumāra, śyena, kṛṣṇa, śveta, and nāga. Then it burns pṛthivī, āpas, tejas, vāyu, and ākāś; then it burns the waking, the dreaming, the dreamless sleeping and the fourth states as well as the maharlokas and worlds higher; then it burns the lokāloka (the highest world forming a limit to the other worlds). Then it burns dharma and adharma. Then it burns that which is beyond, is sunless, limitless, and worldless. Then it burns mahat; it burns avyakta; it burns akṣara; it burns mṛtyu; and mṛtyu becomes one with the great Lord. Beyond Him, there is neither Sat nor asat, nor Sat-asat. Thus is the exposition of Nirvāṇa, and thus is the exposition of the Vedas; yea, thus is the exposition of the Vedas."