Vaishampayana — mastered — Yajur Veda
Vaishampayana, sole adept of the Yajus: 'vaiśampāyana evaiko niṣṇāto yajuṣām' (SB 1.4.21). Evidence: EXPLICIT.
Sage
Vaishampayana
वैशम्पायन
Vaishampayana is a chief disciple of Vyasa, custodian of the Yajur Veda (Taittiriya shakha): 'vaiśampāyana evaiko niṣṇāto yajuṣām' (SB 1.4.21); in tradition the first public reciter of the Mahabharata (at Janamejaya's assembly).
Śrīmad Bhāgavata Mahāpurāṇa 1.4.21 — Sanskrit Wikisource (pinned oldid=110175)