The virāṭ-puruṣa’s face is the brāhmaṇas, His arms are the kṣatriyas, His thighs are the vaiśyas, and the śūdras are under the protection of His feet. All the worshipable demigods are also overtaken by Him, and it is the duty of everyone to perform sacrifices with feasible goods to appease the Lord.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
ब्रह्माऽऽननं क्षत्रभुजो महात्मा विडूरुरङ्घ्रिश्रितकृष्णवर्णः । नानाभिधाभीज्यगणोपपन्नो द्रव्यात्मकः कर्म वितानयोगः
brahmā''nanaṃ kṣatrabhujo mahātmā viḍūruraṅghriśritakṛṣṇavarṇaḥ | nānābhidhābhījyagaṇopapanno dravyātmakaḥ karma vitānayogaḥ
SB 2.1.37