Prashna Upanishad Verse 3.3

Sanskrit

आत्मन एष प्राणो जायते । यथैषा पुरुषे छायैतस्मिन्नेतदाततं मनोकृतेनायात्यस्मिञ्शरीरे ॥ ३ ॥

Transliteration

ātmana eṣa prāṇo jāyate | yathaiṣā puruṣe chāyaitasminnetadātataṃ manokṛtenāyātyasmiñśarīre || 3 ||

S. Sitarama Sastri's Translation

This Prana is born of the atman. As this shadow in the man, so is this in the atman. By the act of the mind, this comes into this body.

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Reference: Prashna Upanishad