Shloka 31
Prāyaścitta and Contextual Non-Culpability (प्रायश्चित्त-निमित्त-अदोषवाद)
यदि अपनी स्त्रीके विषयमें पापाचारकी आशड्का हो तो विज्ञपुरुषको रजस्वला होनेतक उनके साथ समागम नहीं करना चाहिये। रजस्वला होनेपर वे उसी प्रकार शुद्ध हो जाती हैं, जैसे राखसे माँजा हुआ बर्तन ।।
vyāsa uvāca | yadi svāṁ striyaṁ viṣaye pāpācārasya āśaṅkā syāt tarhi vijñapuruṣeṇa rajasvalā-bhāva-paryantaṁ tayā saha samāgamo na kartavyaḥ | rajasvalāyāṁ tu sā tathā śuddhā bhavati yathā bhasmanā mārjitaṁ bhājanam || pādajo'cchiṣṭa-kāṁsyaṁ yad gavā prātam athāpi vā | gaṇḍūṣocchiṣṭam api vā viśudhyed daśabhis tu tat ||
毗耶娑说：若男子对其妻之行有罪恶之疑，明智之人当止其房事，直至她来月事。月事既至，便视为清净，如器皿以灰擦洗而净。又如青铜器若因触及首陀罗（Śūdra）洗足之水而染污，或被牛舐，或为他人口漱之水所污，则以所规定的十种净物洗涤，便复归清净。
व्यास उवाच
Educational Q&A
The verse frames purity (śauca) and restraint as part of dharma: when moral suspicion arises, one should refrain from conjugal relations until a socially recognized marker of purification (menstruation) occurs, and it analogizes human purity rules with the ritual cleansing of utensils.
In the didactic setting of Śānti Parva, Vyāsa states prescriptive norms: first about abstaining from intercourse under suspicion until menstruation, then about how a bronze vessel becomes impure through certain contacts and is restored to purity through a tenfold cleansing procedure.