Mahabharata Udyoga Parva Chapter 48:7

Mahabharata Udyoga Parva (Sanat-sujata Parva) Chapter 48:7 Vasudeva, too, endued with all the divine attributes that ensure success, agreed to undertake that exceedingly difficult task. In the city of Nirmochana that hero slew six thousand Asuras, and cutting into pieces innumerable keen-edged shafts, he slew Mura and hosts of Rakshasas, and then entered that city. It was there, that an encounter took place between the mighty Naraka and Vishnu of immeasurable strength. Slain by Krishna, Naraka lay lifeless there, like a Karnikara tree uprooted by the wind. Having slain the Earth's son, Naraka, and also Mura, and having recovered those jewelled ear-rings, the learned Krishna of unparalleled prowess came back, adorned with beauty and undying fame. Having witnessed his terrible feats in that battle, the gods then and there blessed him saying, 'Fatigue will never be thine in fights, neither the firmament nor the waters shall stop thy course, nor shall weapons penetrate thy body.' And Krishna, by all this, regarded himself amply rewarded. Immeasurable, and possessed of great might, in Vasudeva ever exist all the virtues. And yet the son of Dhritarashtra seeketh to vanquish that unbearable Vishnu of infinite energy, for that wretch often thinks of imprisoning him. Krishna, however, beareth all this for our sake only. That wretch seeketh to create a sudden disunion between Krishna and myself. How far, however, he is capable of taking away the affection of Krishna from the Pandavas, he will see on the field of battle. Having bowed down unto Santanu's son, and also Drona with his son, and the unrivalled son of Saradwat, I shall fight for regaining our kingdom. The God of justice himself, I am sure, will bring destruction on that sinful man who will fight with the Pandavas. Deceitfully defeated at dice by those wretches, ourselves, of royal birth, had to pass twelve years in great distress in the forest and one long year in a state of concealment. When those Pandavas are still alive, how shall the sons of Dhritarashtra rejoice, possessing rank and affluence? If they vanquish us in fight, aided by the very gods headed by Indra, then the practice of vice would be better than virtue, and surely there would be nothing like righteousness on earth. If man is affected by his acts, if we be superior to Duryodhana, then, I hope that, with Vasudeva as my second, I shall slay Duryodhana, with all his kinsmen. O lord of men, if the act of robbing us of our kingdom be wicked, if these our own good deeds be not fruitless, than beholding both this and that, it seems to me, the overthrow of Duryodhana is certain. Ye Kauravas, ye will see it with your eyes that, if they fight, the sons of Dhritarashtra shall certainly perish. If they act otherwise instead of fighting, then they may live; but in the event of a battle ensuing, none of them will be left alive. Slaying all the sons of Dhritarashtra along with Karna, I shall surely wrest the hole of their kingdom. Do ye, meanwhile, whatever ye think best, and enjoy also your wives and other sweet things of life.