Mahabharata — Anushasana Parva, Shloka 70
आचारप्रशंसा
Praise of Ācāra as the Basis of Longevity, Fame, and Prosperity
शिर:स्नातस्तु तैलैश्व नांगं किंचिदपि स्पृशेत् । तिलसृष्टं न चाश्नीयात् तथास्यायुर्न रिष्यते
śiraḥ-snātastu tailaiś ca nāṅgaṃ kiñcid api spṛśet | tila-sṛṣṭaṃ na cāśnīyāt tathāsyāyur na riṣyate ||
毗湿摩说道：洗头并涂油之后，不可用同一只手去触碰身体的其他部位；也不可食用以芝麻制成的食物。能守此节制，则人的寿命不致减损。（此教诫属于法所教的更广泛之身净与行持有度的修习。）
भीष्म उवाच
Educational Q&A
The verse teaches regulated personal conduct (ācāra) connected with purity: after oiling the head post-bath, one should avoid touching other body parts with the same hand and avoid eating sesame-based preparations; such discipline is said to protect one’s longevity.
In the Anuśāsana Parva’s dharma-instruction setting, Bhīṣma continues giving Yudhiṣṭhira practical rules of daily conduct and ritual hygiene, presenting them as observances that support health, order, and the maintenance of life.