Manava Dharmashastra 2.196

2.196

kathaṃ tarhi | āsīno yadā''jñāṃ dadāti tadā sthita āsanādutthāya pratiśravaṇasambhāṣe kuryāt | abhigacchaṃstu tiṣṭhataḥ | tiṣṭhangururyadā''diśati tadā''bhigacchaṃstadabhimukhaṃ katicitpadāni gatvā | āvrajata āgacchataḥ pratyudgamyābhimukhameva gatvā | pratirābhimukhye | dhāvato vegena gacchataḥ paścāddhāvan |

He should do (these) standing, when the teacher is seated; advancing towards him, when he is standing; going forward to him, when he advances; and running after him, when he runs;—(196)

Medhātithi’s commentary (manubhāṣya):
[The question arising ]—“How then is he to listen to and converse with the Teacher?”—the Text answers:—When the Teacher gives his directions seated, then the pupil should rise from his seat, and do the ‘listening and conversing’ while standing.

‘Advancing towards him, when he is standing’;—when the Teacher gives his orders standing, the pupil should advance towards him a few steps.

‘Going forward to him, when he advances’;—i.e., going up to the teacher. The prefix ‘prati’ has the sense of being face to face.

‘When he runs’—moves with force; he should run behind him.