Final answer:
The beginning of the caste system in Indian society can be found in the Rigveda, the oldest text in Hinduism's most sacred scriptures. It describes how the four original castes were created.
Step-by-step explanation:
The beginning of the caste system in Indian society can be found in the Rigveda. The Rigveda is the oldest text in Hinduism's most sacred scriptures and offers a mythical origin of the caste system. It describes how the primordial man, called Purusha, sacrifices himself to create humanity, and from his body, the four original castes are created.