Shloka 71
आचारप्रशंसा
Praise of Ācāra as the Basis of Longevity, Fame, and Prosperity
नाध्यापयेत् तथोच्छिष्टो नाधीयीत कदाचन । वाते च पूतिगन्धे च मनसापि न चिन्तयेत्
na adhyāpayet tathocchiṣṭo nādhīyīta kadācana | vāte ca pūtigandhe ca manasāpi na cintayet ||
毗湿摩说道：凡因进食而处于不净之态者（口中尚有食余），不应教授圣典，也绝不可自行诵习（svādhyāya）。即便有恶臭之风吹来，也不应在心中起诵读之念。此教诲强调对吠陀学习与传授的敬畏，将身心与环境的清净视为持守法（dharma）之纪律的一部分。
भीष्म उवाच
Educational Q&A
Sacred teaching and self-recitation should be done only in a clean, respectful state: one should not teach or recite while ucchiṣṭa (with food-remnants/impurity), and should avoid even mental recitation in an environment made impure by foul odor.
In the Anuśāsana Parva’s instruction on dharma and proper conduct, Bhīṣma lays down practical rules of ācāra for study/teaching—specifying when recitation is prohibited due to personal impurity (ucchiṣṭa) or an unsuitable environment (malodorous wind).