Vaishnava Dharmashastra 29.1

29.1

yas tūpanīya vratādeśaṃ kṛtvā vedam adhyāpayet tam ācāryaṃ vidyāt ||

He who having initiated a youth and instructed him in the Vratas, teaches him (one branch of) the Veda (together with its Angas, such as that relating to phonetics, and the rest) is called Âkârya (teacher).
Taitt. Ârany. I, 30.
XXIX. 1. Âpast. I, 1, 1, 13; Gaut., I, 9.--13. M. II. 140-143; Y. I, 34, 35.--7-10. M. II, 111, 112, 114, 115.--9, 10. See Bühler, Introd. to Digest, p. xxix.
1. The Vratas of a student are certain observances to be kept by him before he is admitted to the regular course of study of the Veda, and again before he is allowed to proceed to the study of the Mahânâmnî verses and to the other higher stages of Vedic learning. See, particularly, Sânkh. II, 11, 12, with Dr. Oldenberg's note (Ind. Stud. XV, 139).]