One of the seven padas (posts) in the religious order;
the ascetic who has insight in the Sūtra (2) (canonical aphorism), is an erudite semanticist and is worthy of holding dignified office of the Ācārya (preceptor) and the teacher of the Sūtra (2).
....āyarie vā uvajjhāe vā pavattī vā there vā gaṇī vā gaṇahare vā gaṇāvaccheie vā.
(ĀCūlā 1.130)
upādhyāyaḥ adhyāpakāḥ.
(Ā Vṛ Pa 236)
sammattanāṇasaṃjamajutto suttatthatadubhayavihinnū.
āyariyāṭhāṇajogo suttaṃ vāe uvajjāo...
(Prasā 102 Vṛ Pa 24)