Matsyapurana 144.17

144.17

vyākulo dvāpareṣvarthaḥ kriyate bhinnadarśanaiḥ
dvāpare saṃnivṛtte te vedā naśyanti vai kalau //

At first the Advharyu's work was one, afterwards, it was divided into two Owing to distortions and twistings in the meanings the Sastras have been much transformed Therefore the Adhvaryus works are performed in different ways The Sama and Atharva Vedas also were turned and twisted owing to the want of knowledge of the Munis and their want of confidence Thus the state of things in the Dvapara age was in a chaotic condition And in the Kali age the Vedas became extinct Owing to the want of the proper knowledge of the Vedas, the various diseases and disorders and deaths, thereof, became visible The people could not thwart them off by their minds words and deeds, then, they became disgusted and disappointed—18-19