Vishnupurana 3.3.6

3.3.6

vīryaṃ tejo balaṃ cālpaṃ manuṣyāṇāmavekṣya ca /
hitāya sarvabhūtānāṃ vedabhedānkaroti saḥ //

In every Dwápara (or third) age, Vishńu, in the person of Vyása, in order to promote the good of mankind, divides the Veda, which is properly but one, into many portions: observing the limited perseverance, energy, and application of mortals, he makes the Veda fourfold, to adapt it to their capacities; and the bodily form which he assumes, in order to effect that classification, is known by the name of Veda-vyása. Of the different Vyásas in the present Manwantara, and the branches which they have taught, you shall have an account.