Mahabharata 13.109.64

उपोष्य विधिवद्देवास्त्रिदिवं प्रतिपेदिरेऋषयश्च परां सिद्धिमुपवासैरवाप्नुवन्

upoṣya vidhivaddevāstridivaṃ pratipedireṛṣayaśca parāṃ siddhimupavāsairavāpnuvan

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