Gems of Kauravas -You decide+
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In fights, speed and martial exercises, the princes were never able to get the better of Vrikodara(Bheema) in any competition. Thus, in any competition, Dhritarashtra’s sons began to hate Vrikodara, even though he bore no ill will towards them, since he was only a child.
Bhimasena’s great strength became well known. On learning this, Dhritarashtra’s powerful son 320 revealed the evil side of his nature. He was wicked and inclined towards evil. Out of delusion and greed for riches, an evil thought occurred to him. “Kunti’s son Vrikodara, the second of the Pandavas, is the best in strength. I must find some trick so as to kill him. Then I will overpower his younger brother and his elder brother Yudhishthira. I will tie them up and reign as the sovereign of the earth.”
Having made his mind up about this evil act, Duryodhana was always on the lookout for a chance to get at the great-souled Bhima.
When the games were over, they would dress themselves in fresh garments, wear ornaments and quickly eat. When day was over, the valorous Kuru princes would be exhausted from their games and would rest in that sports house. The powerful Bhima always prevailed over the other princes in water sports. But on one occasion, he was tired at there having been an excess of exercise. He wished to sleep in Pramanakoti and climbed up the bank and found a spot. He was clad in a white garment. He was tired and he was under the influence of drink*. O* king! The Pandava was tired and slept like one who was dead. Then Duryodhana quietly tied him up with thongs made of creepers. He rolled him down from the land into the swift and deep waters.
Regaining his consciousness, Kounteya 321 tore apart all the bonds. Bhima, supreme among those who wield arms, arose from the water.
On another occasion when Bhima was again sleeping, he 322 brought many snakes—sharp in teeth, immensely poisonous, angry and virulent. He made them bite him 323 in all the soft spots of his body. But even when they bit him in the soft spots, they could not bring him down. They could not penetrate his skin, because the broad-chested one was too tough. When Bhima woke up, he killed all the snakes. He and his companions 324 became very careful from that time onwards.
He also had poison mixed in Bhimasena’s food. This was freshly made kalakuta poison, so virulent that it made the hair on the body stand up. On this occasion, the Vaishya’s son 325 alerted Pritha’s sons, so as to ensure their welfare.
But though Vrikodara ate this, it had no effect on him. Though the poison was extremely virulent and was meant to kill Bhima, Bhima digested and tolerated it.
‘Then Duryodhana, Karna and Subala’s son Shakuni tried many other means to kill the Pandavas. However, the Pandavas, scorchers of their enemies, got to know about all of these. As advised by Vidura, they never revealed all this.’
Source:- Sambhava Parva, 119