Mbh 8.70.3a

"Sanjaya said, 'Having addressed these harsh and exceedingly bitter words unto his eldest brother and thereby committed a venial sin, the intelligent Savyasaci of calm wisdom, who is ever actuated by the fear of defection from virtue, became very cheerless. The son of the chief of the celestials became filled with remorse and breathing heavily, drew his sword. Seeing this, Krishna asked him, "What is this? Why dost thou again unsheathe thy sword blue as the sky? Tell me what thy answer is, for then I shall give thee counsel for the gratification of thy object." Thus addressed by that foremost of men, Arjuna, in great sorrow answered Keshava, saying, "I shall, putting forth my strength, slay my own self by whom this wicked act hath been done." Hearing those words of Partha, Keshava, that foremost of all righteous persons said this unto Dhananjaya, "Having said these words unto the king, why hast thou become so cheerless? O slayer of foes, thou desirest now to destroy thy own self. This, however, Kiritin, is not approved by the righteous. If, O hero among men, thou hadst today, from fear of sin, slain this thy eldest brother of virtuous soul, what would then have been thy condition and what wouldst thou not then have done? Morality is subtle, O Bharata, and unknowable, especially by those that are ignorant. Listen to me as I preach to thee. By destroying thy own self, thou wouldst sink into a more terrible hell than if thou hadst slain thy brother. Declare now, in words, thy own merit. Thou shalt then, O Partha, have slain thy own self." Applauding these words and saying, "Let it be so, O Krishna," Dhananjaya, the son of Sakra, lowering his bow, said unto Yudhishthira, that foremost of virtuous persons, "Listen, O king, there is no other bowman, O ruler of men, like unto myself, except the deity that bears Pinaka; I am regarded by even that illustrious deity. In a moment I can destroy this universe of mobile and immobile creatures.