Shloka 9
Cyavana’s Water-Vow and the Ethics of Cohabitation (स्नेह-सम्वास-धर्मः)
शूद्रां शयनमारोप्य ब्राह्मणो यात्यधोगतिम् । प्रायश्षित्तीयते चापि विधिदृष्टेन कर्मणा
śūdrāṁ śayanam āropya brāhmaṇo yāty adhogatim | prāyaścittīyate cāpi vidhidṛṣṭena karmaṇā ||
ビーシュマは言った。「ブラーフマナ（Brāhmaṇa）がシュードラ（Śūdra）の女を自らの床に上げるなら（すなわち禁じられた交合に及ぶなら）、彼はより低い境位へと堕ちる。されど、規定に従って定められた贖罪（prāyaścitta）の儀礼を行えば、清められることもある。」
भीष्म उवाच
Educational Q&A
The verse states that violating prescribed sexual boundaries (a brāhmaṇa taking a śūdra woman to bed) is a serious dharmic transgression leading to moral/spiritual decline, but it also affirms the dharma-śāstric principle that such faults can be addressed through properly prescribed prāyaścitta (expiatory rites).
In Anuśāsana Parva, Bhīṣma instructs Yudhiṣṭhira on dharma, including social and ritual norms. Here he gives a rule-and-remedy formulation: he names a prohibited act and then notes that purification is possible through the expiation laid down by scriptural injunction.