Yudhiṣṭhira, who was born without any enemy, was unfairly defeated in gambling. But because he had taken the vow of truthfulness, he went off to the forest. When he came back in due course and begged the return of his rightful share of the kingdom, he was refused by Dhṛtarāṣṭra, who was overwhelmed by illusion.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
द्यूते त्वधर्मेण जितस्य साधोः सत्यावलम्बस्य वनागतस्य । न याचतोऽदात्समयेन दायं तमो जुषाणो यदजातशत्रोः
dyūte tvadharmeṇa jitasya sādhoḥ satyāvalambasya vanāgatasya | na yācato'dātsamayena dāyaṃ tamo juṣāṇo yadajātaśatroḥ
SB 3.1.8