Mahabharata 14.86.4

एतस्मिन्नेव काले तु द्वादशीं माघपाक्षिकीम्इष्टं गृहीत्वा नक्षत्रं धर्मराजो युधिष्ठिरः

etasminneva kāle tu dvādaśīṃ māghapākṣikīmiṣṭaṃ gṛhītvā nakṣatraṃ dharmarājo yudhiṣṭhiraḥ

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