Vishnupurana 3.4.21

3.4.21

vedamitras tu śākalyaḥ saṃhitāṃ tām adhītavān
cakāra saṃhitāḥ pañca śiṣyebhyaḥ pradadau ca tāḥ //

This vast original tree of the Vedas, having been divided by him into four principal stems, soon branched out into an extensive forest. In the first place, Paila divided the Rig-veda, and gave the two Sanhitás (or collections of hymns) to Indrapramati and to Báshkali. Báshkali subdivided his Sanhitá into four, which he gave to his disciples Baudhya, Agnimát́hara, Yajnawalka, and Paráśara; and they taught these secondary shoots from the primitive branch. Indrapramati imparted his Sanhitá to his son Mańd́ukeya, and it thence descended through successive generations, as well as disciples. Vedamitra, called also Śákalya, studied the same Sanhitá, but he divided it into five Sanhitás, which he distributed amongst as many disciples, named severally Mudgala, Goswalu, Vátsya, Śálíya, and Śiśira. Sákapúrńi made a different division of the original Sanhitá into three portions, and added a glossary (Nirukta), constituting a fourth. The three Sanhitás were given to his three pupils, Krauncha, Vaitálaki, and Valáka; and a fourth, (thence named) Niruktakrit, had the glossary. In this way branch sprang from branch. Another Báshkali composed three other Sanhitás, which he taught to his disciples Káláyani, Gárgya, and Kathájava. These are they by whom the principal divisions of the Rich have been promulgated.