The Great Epic of the Bhārata dynasty 1.55.15

1.55.15

yadā tu vividhopāyaiḥ saṃvṛtairvivṛtairapi |
nāśaknodvinihantuṃ tāndaivabhāvyartharakṣitān || 15 ||

"When Duryodhana, with various means, both secret and open, found himself incapable of destroying the Pandavas who were protected by the fates and kept alive for grave future purposes (such as the extermination of the Kuru race), then called together his counsellors consisting of Vrisha (Karna), Duhsasana and others, and with the knowledge of Dhritarashtra caused a house of lac to be constructed. And king Dhritarashtra, from affection for his children, and prompted by the desire of sovereignty, sent the Pandavas tactfully into Varanavata. And the Pandavas then went away with their mother from Hastinapura. And when they were leaving the city, Vidura gave them some idea of impending danger and how they could come out of it.