Mahabharata 3.115.6

चतुर्दशीमष्टमीं च रामं पश्यन्ति तापसाःअस्यां रात्र्यां व्यतीतायां भवित्री च चतुर्दशी

caturdaśīmaṣṭamīṃ ca rāmaṃ paśyanti tāpasāḥasyāṃ rātryāṃ vyatītāyāṃ bhavitrī ca caturdaśī

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