Nadabindu Upanishad Verse 48
Sanskrit
निःशब्दं तत्परं ब्रह्म परमात्मा समीर्यते । नादो यावन्मनस्तावन्नादान्तेऽपि मनोन्मनी ॥ ४८॥
K. Narayanasvami Aiyar's Translation
The mind exists so long as there is sound, but with its (sound’s) cessation, there is the state called unmanī of manas (viz., the state of being above the mind).
Reference: Nadabindu Upanishad

Muni's Play