Mahabharata 13.110.90
द्वाविंशे दिवसे प्राप्ते यो भुङ्क्ते ह्येकभोजनम्सदा द्वादश मासान्वै जुह्वानो जातवेदसम्
dvāviṃśe divase prāpte yo bhuṅkte hyekabhojanamsadā dvādaśa māsānvai juhvāno jātavedasam
Our plain-language meaning of this verse is waiting for scholar review.
Open in the book