Mahabharata 1.1.91

1.1.91

sa bhogānvividhānbhuñjanratnāni vividhāni ca |
kathito dhṛtarāṣṭrasya vivarṇo hariṇaḥ kṛśaḥ || 91 ||

And it was represented to Dhritarashtra that his son, while partaking of various objects of enjoyment and diverse precious things, was becoming meagre, wan, and pale. And Dhritarashtra, some time after, out of affection for his son, gave his consent to their playing (with the Pandavas) at dice. And Vasudeva coming to know of this, became exceedingly wroth. And being dissatisfied, he did nothing to prevent the disputes, but overlooked the gaming and sundry other horried unjustifiable transactions arising therefrom: and in spite of Vidura, Bhishma, Drona, and Kripa, the son of Saradwan, he made the Kshatriyas kill each other in the terrific war that ensued.'