Mahabharata 2.45.5

2.45.5

na vai parīkṣase samyagasahyaṃ śatrusaṃbhavam |
jyeṣṭhaputrasya śokaṃ tvaṃ kimarthaṃ nāvabudhyase || 5 ||

Vaisampayana said--"O king, impressed with the great Rajasuya sacrifice of king Yudhishthira, Sakuni, the son of Suvala, having learnt before the intentions of Duryodhana, while accompanying him in the way from the assembly house, and desirous of saying what was agreeable to him, approached Dhritarashtra endued with great wisdom, and finding the monarch deprived of his eye seated (in his throne), told him these words,--'Know, O great king, O bull of the Bharata race, that Duryodhana, having lost colour, hath become pale and emaciated and depressed and a prey to anxiety. Why dost thou not, after due enquiry, ascertain the grief that is in the heart of thy eldest son, the grief that is caused by the foe?'