MAHABHARATA CHAPTER 51 SALYA AGAINST HIS NEPHEWS
"When they started talking about obtaining his help in the war that was impending, Salya related to them the story of his promise to Duryodhana. Yudhishthira saw at once that it had been a mistake to take Salya's assistance for granted, thereby letting Duryodhana forestall them." MB 51 (Mahabharata Retold By C. Rajagopalachari)
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