The Vedas are primal knwledge source known to the mandind. Its supremacy in verbal cvidence is undisputed to all branches of Shastras. Even the adversaties of the Vedic authenticity like Bauddha and Jain are also having traces of Vedic evidences directly of indirectly.
Vedanga vyakaranasya mahatvam, Kalashastr ke vaidika stora, Vedo me brahman ek vimarsha.