ब्रह्म चारिणः स्वाध्यायो अग्नि कार्य अभिषेकौ भैक्ष व्रतित्वम् आचार्ये प्राण अन्तिकी वृत्तिस् तद् अभावे गुरु पुत्रे स ब्रह्म चारिणि वा ॥
That of a student (Brahmacharin) is learning the Vedas, fire-worship, ablution, living by begging, and devotion to his teacher even at the cost of his own life, or in the absence of his teacher, to the teacher's son, or to an elder classmate.