Mahabharata 13.128.40

अतिथिव्रतता धर्मो धर्मस्त्रेताग्निधारणम्इष्टीश्च पशुबन्धांश्च विधिपूर्वं समाचरेत्

atithivratatā dharmo dharmastretāgnidhāraṇamiṣṭīśca paśubandhāṃśca vidhipūrvaṃ samācaret

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