Mahabharata 5.160.23

न द्वितीयां प्रतिज्ञां हि प्रतिज्ञास्यति केशवःसत्यं ब्रवीम्यहं ह्येतत्सर्वं सत्यं भविष्यति

na dvitīyāṃ pratijñāṃ hi pratijñāsyati keśavaḥsatyaṃ bravīmyahaṃ hyetatsarvaṃ satyaṃ bhaviṣyati

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