KENA UPANISHAD · 4/7
उपनिषदं भो ब्रूहीत्युक्ता त उपनिषद् ब्राह्मीं वाव त उपनिषदमब्रूमेति ॥
upaniṣadaṃ bho brūhītyuktā ta upaniṣad brāhmīṃ vāva ta upaniṣadamabrūmeti ॥
Thou hast said 'Speak to me Upanishad'; spoken to thee is Upanishad. Of the Eternal verily is the Upanishad that we have spoken.
Sri Aurobindo · CWSA 18, p. 11