Answer:
Nowadays, a mythical record in the form of religious literature known as The Vedas, one of the most important religious books in Indian history. "The Vedas are a collection of hymns and other ancient religious texts written in India between about 1500 and 1000 BCE. It includes elements such as liturgical material as well as mythological accounts, poems, prayers, and formulas considered to be sacred by the Vedic religion."
The concept of Varna and the rules of marriage. Varna once invited speculation that class distinctions were originally based on differences in degree of skin pigmentation between an alleged group of lighter-skinned invaders called “Aryans” and the darker indigenous people of ancient India, this theory has been discredited since the mid-20th century.
References:
Britannica, The Editors of Encyclopaedia. “Varna.” Encyclopædia Britannica, Encyclopædia Britannica, Inc
Cultural India. “Vedic Age.” Vedic Age- Vedic Period, 2019
Violatti, Cristian. “Aryan.” Ancient History Encyclopedia, Ancient History Encyclopedia, 13 Oct. 2019