Mahabharata 3.211.26

यद्यग्नयो हि स्पृश्येयुर्निवेशस्था दवाग्निनाइष्टिरष्टाकपालेन कार्या तु शुचयेऽग्नये

yadyagnayo hi spṛśyeyurniveśasthā davāgnināiṣṭiraṣṭākapālena kāryā tu śucaye'gnaye

Our plain-language meaning of this verse is waiting for scholar review.