Mundaka Upanishad Verse 1.1.8

Sanskrit

तपसा चीयते ब्रह्म ततोऽन्नमभिजायते । अन्नात्प्राणो मनः सत्यं लोकाः कर्मसु चामृतम् ॥ ८ ॥

Transliteration

tapasā cīyate brahma tato’nnamabhijāyate | annātprāṇo manaḥ satyaṃ lokāḥ karmasu cāmṛtam || 8 ||

Translation

By tapas Brahman increases in size and from it food is produced; from food the prana, the mind, the Bhutas (the elements), the worlds, karma and with it, its fruits.

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Reference: Mundaka Upanishad, Prana in Upanishads