Question

tell the oldest of Vedas.

Answer 1

The Rigveda is the oldest work, which Witzel states are probably from the period of 1900 to 1100 BCE. Witzel, also notes that it is the Vedic period itself, where incipient lists divide theVedic texts into three (trayī) or four branches: Rig, Yajur, Sama and Atharva.

Answer 2

Rig Veda is the oldest of Vedas