Manu establishes the absolute supremacy of Brahmanas, mandating their exclusive right to study the Veda and perform sacred rites while excluding Sudras from these privileges. Twice-born men must honor their teachers and parents to gain merit, whereas Sudras are defined as innate slaves destined to serve the twice-born for beatitude. The text enforces a hierarchical structure where caste duties, marriage restrictions, and purification rites maintain purity and prevent exclusion from sacred rites. Brahmanas are to reject royal gifts and avoid Sudras, teaching sacred law under penalty of hell, while twice-born men must cremate faithful wives before remarrying.

The law prescribes caste-based justice, with penalties varying by status; Brahmanas and Kshatriyas face fines, while Sudras endure corporal punishment, including tongue removal for insulting twice-born men. Kings enforce these laws to maintain order, protecting subjects and punishing thieves, while never angering Brahmanas, who are revered as deities. Virtuous wives must remain faithful to gain heavenly reward, with those seeking offspring elsewhere or cohabiting with higher-caste men declared disgraceful and punishable by rebirth as a jackal. The text asserts that adherence to these rules ensures heavenly bliss and avoids rebirth, while Vedic knowledge supersedes ritual sacrifice for Brahmanas, serving as the supreme authority governing all castes and ensuring happiness through purification and union with Brahman.