" The Vedas were first composed in Sanskrit approximately 3800 BC. Previous to even this time, this literature is known to have been preserved orally, and passed down from generation to generation of priests, seers and sages before finally being committed to writing. Thus, no one can accurately date the antiquity of the Vedas and consequently of Dharma. Dharma is one of the most ancient concepts known to humanity. The word “Dharma” is found repeatedly throughout the entire corpus of the Vedic scriptures, from the earliest Rig Veda to the Bhagavad Gita. There is almost no scripture in the entirety of the Vedic literature where one will not come across the word “Dharma” as the preeminent name of the religio-philosophical world-view taught in these ancient, sacred texts. Sometimes the word “Dharma” is used by itself; at other times it is used in conjunction with other qualifying words, such as “Vaidika Dharma” (Vedic Dharma), “Vishva Dharma” (Global Dharma), “Yoga Dharma” (the Dharma of Union), or more frequently as "Sanatana Dharma" (the Eternal Natural Way). The diversity of adjectival emphases will vary in accordance with the precise context in which the word is used. Of these terms, the name “Sanatana Dharma” has been the most widely used name of the path of Truth, and is used as far back as the Rig Veda (3800 BC), the very earliest scripture of the Indo-European peoples, and the earliest written text known to humanity. It is also the most philosophically profound and conceptually beautiful name for the path of Truth. (p. 42) "
― , Sanatana Dharma: The Eternal Natural Way