Prashna Upanishad Verse 2.6

Sanskrit

अरा इव रथनाभौ प्राणे सर्वं प्रतिष्ठितम् । ऋचो यजूँषि सामानि यज्ञः क्शत्रं ब्रह्म च ॥ ६ ॥

Transliteration

arā iva rathanābhau prāṇe sarvaṃ pratiṣṭhitam | ṛco yajūm̐ṣi sāmāni yajñaḥ kśatraṃ brahma ca || 6 ||

S. Sitarama Sastri's Translation

As spokes in the nave of a wheel, so all is centred in Prana. Riks, Yajur, Samams, sacrifices, Kshatriyas and Brahmins.

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Reference: Prashna Upanishad