PrU 3.8
आदित्यो ह वै बाह्यः प्राण उदयति । एष ह्य् एनं चाक्षुषं प्राणम् अनुगृह्णानः । पृथिव्यां या देवता सैषा पुरुषस्यापानम् अवष्टभ्य । अन्तरा यदाकाशः स समानः । वायुर् व्यानः
ādityo ha vai bāhyaḥ prāṇa udayati | eṣa hy enaṃ cākṣuṣaṃ prāṇam anugṛhṇānaḥ | pṛthivyāṃ yā devatā saiṣā puruṣasyāpānam avaṣṭabhya | antarā yadākāśaḥ sa samānaḥ | vāyur vyānaḥ
Devanagari rendered by HREEM from the edition's roman (IAST) text; the IAST is the edition's own.
The sun rises as the external Prâna, for it assists the Prâna in the eye. The deity that exists in the earth, is there in support of man's Apâna (down-breathing). The ether between (sun and earth) is the Samâna (on-breathing), the air is Vyâna (back-breathing).
Translated by F. Max Müller