व्यासशिष्योत्पत्तिवर्णन (Origins/Enumeration of Vyāsa’s Disciplic Succession) — Chapter on Vedic Transmission Lineages
त्रिधा भेदास्तु ते वेदभेदे ऽस्मिन्नवमे शुभे / उदीच्या मध्यदेश्याश्च प्राच्यश्चैव पृथग्विधाः
tridhā bhedāstu te vedabhede 'sminnavame śubhe / udīcyā madhyadeśyāśca prācyaścaiva pṛthagvidhāḥ
In this auspicious ninth division of Vedic tradition, those distinctions are threefold: Udīcya, Madhyadeśya, and Prācya—each of a separate kind.