Bhagavatapurana 2.1.37

2.1.37

brahmānanaṃ kṣatrabhujo mahātmā viḍūruraṅghriśritakṛṣṇavarṇaḥ /
nānābhidhābhījyagaṇopapanno dravyātmakaḥ karma vitānayogaḥ //

37. The Brahmin is His mouth; the Kshatriya is the arm of Atman; the Vaisya is His thighs; the dark coloured Sudra is His feet; He consists of the substance which is composed of the great gods of various names; the performance of sacrifices is His object in view.