To understand what a Brahmin is, we have to look at two different definitions: the traditional social structure of ancient India and the radical "moral rebrand" the Buddha gave the term.
In the Vedic tradition of the Buddha's time, a Brahmin (Brāhmaṇa) was a member of the highest of the four social classes (castes), known as Varnas.
Birthright: You were born a Brahmin; it wasn't something you could "earn."
Role: They were the keepers of the Vedas (sacred texts), the performers of rituals, and the mediators between gods and humans.
Status: They were considered "ritually pure" and held the highest status in the social hierarchy.
The Buddha lived in a time of great social transition. He fundamentally challenged the idea that birth determines worth. In his teaching, he took the word "Brahmin"—which already commanded great respect—and redefined it to mean an enlightened or spiritually perfected person.
In the Dhammapada (specifically the chapter called the Brahmana Vagga), the Buddha explains that being a Brahmin is about conduct, not ancestry.
Key Principles of the "True Brahmin":
Not by Birth: The Buddha famously said, "Not by matted hair, nor by lineage, nor by birth is one a Brahmin. But in whom there are truth and dharma, he is pure, he is a Brahmin."
No Attachments: A true Brahmin is someone who has "cut the strap and the thong"—meaning they have broken the chains of craving and anger.
Harmlessness: A Brahmin is one who does not use violence and is friendly among the hostile.
Internal Purity: While traditional Brahmins focused on ritual bathing for purification, the Buddha taught that true purity is internal. A "true" Brahmin is someone who has washed away their mental defilements (greed, hatred, and delusion).
By doing this, the Buddha was essentially saying: "If you want to be called 'noble' or 'holy,' you have to act that way. Your bloodline doesn't do the work for you."