Srimad-Bhagavatam: Canto 12 - Chapter 1 - Verse 46
Sanskrit:
ते परम्परया प्राप्तास्तत्तच्छिष्यैर्धृतव्रतै: ।चतुर्युगेष्वथ व्यस्ता द्वापरादौ महर्षिभि: ॥ ४६ ॥
ITRANS:
te paramparayā prāptāstat-tac-chiṣyair dhṛta-vrataiḥcatur-yugeṣv atha vyastādvāparādau maharṣibhiḥ
Translation:
In this way, throughout the cycles of four ages, generation after generation of disciples — all firmly fixed in their spiritual vows — have received these Vedas by disciplic succession. At the end of each Dvāpara-yuga the Vedas are edited into separate divisions by eminent sages.