Mbh 9.32.11

"'Yudhishthira said, "How is it, O Duryodhana, that thou hadst not this knowledge when many great car-warriors, uniting together, slew Abhimanyu in battle? Kshatriya duties are exceedingly cruel, unmindful of all considerations, and without the least compassion! Otherwise, how could you slay Abhimanyu under those circumstances? All of you were acquainted with righteousness! All of you were heroes! All of you were prepared to lay down your lives in battle! The high end declared for those that fight righteously is the attainment of the regions of Shakra! If this be your duty, that one should never be slain by many, why is it then that Abhimanyu was slain by many, acting in accord with thy counsels? All creatures, when in difficulty forget considerations of virtue. They then view the gates of the other world to be closed. Put on armour, O hero, and bind thy locks! Take everything else, O Bharata, of which thou standest in need! This another wish of thine, O hero, I grant thee in addition, that if thou canst slay him amongst the five Pandavas with whom thou wishest an encounter, thou shalt then be king! Otherwise, slain (by him), thou shalt proceed to heaven! Except thy life, O hero, tell us what boon we may grant thee."