Mahabharata 12.221.28

श्रीरुवाचस्वधर्ममनुतिष्ठत्सु धैर्यादचलितेषु चस्वर्गमार्गाभिरामेषु सत्त्वेषु निरता ह्यहम्

śrīruvācasvadharmamanutiṣṭhatsu dhairyādacaliteṣu casvargamārgābhirāmeṣu sattveṣu niratā hyaham

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