Mahabharata 3.228.18

3.228.18

śakuniruvāca |
dharmajñaḥ pāṇḍavo jyeṣṭhaḥ pratijñātaṃ ca saṃsadi |
tena dvādaśa varṣāṇi vastavyānīti bhārata || 18 ||

"Sakuni said, 'The eldest of the sons of Pandu is cognisant of morality. He pledged in the midst of the assembly, O Bharata, that he would live for twelve years in the forest. The other sons of Pandu are all virtuous and obedient to Yudhishthira. And Yudhishthira himself, the son of Kunti, will never be angry with us. Indeed, we desire very much to go on a hunting expedition, and will avail of that opportunity for supervising the tale of our cattle. We have no mind to see the sons of Pandu. We will not go to that spot where the Pandavas have taken up their residence, and consequently no exhibition of misconduct can possibly arise on our part.'