All About Bharatiya Sanatana Dharmam otherwise known as Hinduism : Ch-3.14-1.
CHAPTER- 3 : HINDU DHARMA- 14-1.
14.The Four Castes-1.
In Purusha-Sukta of the Rig-Veda, there is reference to the division of Hindu society into four classes. It is described there that the Brahmanas came out of the face of the Lord, the Creator, Kshatriyas from His arms, Vaisyas from His thighs, and the Sudras from His feet.
This division is according to the Guna and Karma. Guna (quality) and Karma (kind of work) determine the caste of a man. This is supported by Lord Krishna in the Gita, also. He says in the Gita: “The four castes were emanated by Me, by the different distribution of qualities and actions. Know Me to be the author of them, though the actionless and inexhaustible” (Ch. IV-13).
To be continued...