Mahabharata 3.83.25

तत्रेशानं समभ्यर्च्य त्रिरात्रोपोषितो नरःदशाश्वमेधमाप्नोति गाणपत्यं च विन्दतिउष्य द्वादशरात्रं तु कृतात्मा भवते नरः

tatreśānaṃ samabhyarcya trirātropoṣito naraḥdaśāśvamedhamāpnoti gāṇapatyaṃ ca vindatiuṣya dvādaśarātraṃ tu kṛtātmā bhavate naraḥ

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