Verse 40

³⁴As he was about to lead the enemy to the camp, tied by force with a rope, the Bhagavan whose eyes are lotuses spoke to Arjuna in anger. ³⁵Son of Prtha, you must not save this one. Kill this disgrace to the brahmanas, who killed sleeping boys who had done no wrong, at night. ³⁶One who knows dharma does not kill an enemy who is drunk, or off his guard, or out of his mind, or asleep, a child, a woman, a simpleton, one who has come for refuge, one without a chariot, or one who is afraid. ³⁷For a shameless scoundrel who feeds his own life on the lives of others, his killing is a good even for him, since by that fault a man goes downward.

³⁸And you yourself promised the Pancala princess, while I listened: proud lady, I shall bring you the head of the man who killed your sons. ³⁹So let this wicked man be killed, this assassin, who murdered his own kinsmen and did his master no pleasure either, hero, this defiler of his line. ⁴⁰Urged in this way by Krsna, who was testing his sense of duty, the son of Prtha, great-souled, did not wish to kill his teacher's son, though that man had killed his own.