Mundaka Upanishad Verse 3.1.4

Sanskrit

प्राणो ह्येष यः सर्वभूतैर्विभाति विजानन्विद्वान्भवते नातिवादी । आत्मक्रीड आत्मरतिः क्रियावानेष ब्रह्मविदां वरिष्ठः ॥ ४ ॥

Transliteration

praṇo hyeṣa yaḥ sarvभूतairvibhāti vijānanvidvānbhavate nātivādī | ātmakrīḍa ātmaratiḥ kriyāvāneṣa brahmavidāṃ variṣṭhaḥ || 4 ||

Translation

This is, indeed, Prana (shining as Isvara), shining variously in all living beings. Knowing Him, the wise man becomes not a talker regarding anything else. Sporting in the Self, delighted in the Self, and performing his duties, this man is the best among those who know Brahman.

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Reference: Mundaka Upanishad, Prana in Upanishads