Prashna Upanishad Verse 5.2

Sanskrit

एतद्वै सत्यकाम परं चापरं च ब्रह्म यदोङ्कारः । तस्माद्विद्वानेतेनैवायतनेनैकतरमन्वेति ॥ २ ॥

Transliteration

etadvai satyakāma paraṃ cāparaṃ ca brahma yadoṅkāraḥ | tasmādvidvānetenaivāyatanenaikataramanveti || 2 ||

S. Sitarama Sastri's Translation

The syllable ‘Om’ is verily the higher and lower Brahman. Therefore, the knower, by this means, surely reaches either of them.

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Reference: Prashna Upanishad