Mahabharata 7.54.25

यत्पार्थेन प्रतिज्ञातं तत्तथा न तदन्यथाचिकीर्षितं हि ते भर्तुर्न भवेज्जातु निष्फलम्

yatpārthena pratijñātaṃ tattathā na tadanyathācikīrṣitaṃ hi te bharturna bhavejjātu niṣphalam

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