BṚHADĀRAṆYAKA UPANISHAD · 3.9.9

तद् आहुर् यद् अयम् एक इवैव पवते ।
अथ कथम् अध्यर्ध इति ।
यद् अस्मिन्न् इदं सर्वम् अध्यार्ध्नोत् तेनाध्यर्ध इति ।
कतम एको देव इति ।
प्राण इति ।
स ब्रह्म त्यद् इत्य् आचक्षते ॥

tad āhur yad ayam eka ivaiva pavate ।
atha katham adhyardha iti ।
yad asminn idaṃ sarvam adhyārdhnot tenādhyardha iti ।
katama eko deva iti ।
prāṇa iti ।
sa brahma tyad ity ācakṣate ॥

Here they say: 'How is it that he who blows like one only, should be called one and a half (adhyardha)?' And the answer is: 'Because, when the wind was blowing, everything grew (adhyardhnot).' He asked: 'Who is the one god?' Yâgñavalkya replied: 'Breath (prâna), and he is Brahman (the Sûtrâtman), and they call him That (tyad).'

F. Max Müller · The Upanishads, Sacred Books of the East 15 (1884)