PRAŚNA UPANISHAD · 2.6

अरा इव रथनाभौ प्राणे सर्वं प्रतिष्ठितम् ।
ऋचो यजूंषि सामानि यज्ञः क्षत्रं ब्रह्म च ॥ २.६॥

arā iva rathanābhau prāṇe sarvaṃ pratiṣṭhitam ।
ṛco yajūṃṣi sāmāni yajñaḥ kṣatraṃ brahma ca ॥ 2.6॥

“‘As the spokes meet in the nave of a wheel, so are all things in the Breath established, the Rigveda and the Yajur and the Sama, and Sacrifice and Brahminhood and Kshatriyahood.