Vishnupurana 3.6.30

3.6.30

iti śākhāḥ samākhyātāḥ śākhābhedās tathaiva ca
kartāraś caiva śākhānāṃ bhedahetus tathoditaḥ //

I have thus described to you the branches of the Vedas, and their subdivisions; the persons by whom they were made; and the reason why they were made (or the limited capacities of mankind). The same branches are instituted in the different Manwantaras. The primitive Veda, that of the progenitor of all things, is eternal: these branches are but its modifications (or Vikalpas).