Manava Dharmashastra 2.191

2.191

nodito guruṇā'niyukto'pi kuryādadhyayane yogaṃ yatnam | "nanu cāhūto'dhīyīta ityuktam | kathamapracoditasya yoga ucyate ?" gṛhītavedaikadeśasya pariśeṣakaguṇārthametaducyate | na tatrācāryaniyogo'pekṣitavyaḥ | evamācāryāya hitaṃ yadudakumbhāharaṇādi śrāntasaṃvāhanādi tadapyaniyuktena kartavyam |

Prompted by the Teacher, or even when not prompted, he should put forth his exertion to study, and also to doing what is helpful to the teacher.—(191)

Medhātithi’s commentary (manubhāṣya):
‘Prompted’—ordered—‘by the teacher, he put forth his exertion’—make an effort—‘to study.’

“It has been already laid down that ‘one should rend when wanted by the Teacher.’ How then can there he any exertion put forth by one who is not prompted?”

What is here said refers to the student who has learnt a part of the Veda, and is going to learn the remainder; for this latter the ‘instruction of the teacher’ is not necessary.

Similarly he should do, without being told to do so, such helpful acts for the teacher as fetching jars of water, massaging his body whenever he happens to be fatigued, and so forth.—(191)