Mbh 12.242.5b

[996] He should never eat before his preceptor has eaten; never drink before his preceptor has drunk; never sit down before his preceptor has sat down; and never go to bed before his preceptor has gone to bed. He should gently touch his preceptor's feet with upturned palms, the right foot with the right and the left with the left. Reverentially saluting the preceptor, he should say unto him, "O illustrious one, teach me. I shall accomplish this (work), O illustrious one! This (other work) I have already accomplished. O regenerate one, I am ready to accomplish whatever else thy reverend self may be pleased to command." Having said all this, and having duly offered himself unto him (thus), he should accomplish whatever acts of his preceptor wait for accomplishment, and having completed them inform the preceptor once more of their completion. Whatever scents or tastes the Brahmacharin may abstain from while actually leading a life of Brahmacharya may be used by him after his return from the preceptor's abode. This is consistent with the ordinance. Whatever observances have been elaborately laid down for Brahmacharins (in the scriptures) should all be regularly practised by him. He should, again, be always near his preceptor (ready within call). Having contributed to his preceptor's gratification in this way to the best of his powers, the disciple should, from that mode of life, pass into the others (one after another) and practise the duties of each. Having (thus) passed a fourth part of his life in the study of the Vedas, and observance of vows and fasts, and having given the preceptor the (final) fee, the disciple should, according to the ordinance, take his leave and return home (for entering into a life of domesticity).