Mahabharata Sabha Parva(Jarasandhta-badha Parva)
Mahabharata Sabha Parva Chapter 22:2
Hostility with whom else than thee is so sure of leading to heaven, proud as thou art of the excessive strength of thy vast Magadha host? Don't disregard others, O king. Valour dwelleth in every man. O king of men, there are many men whose valour may be equal or superior to thine. As long as these are not known, so long only art thou noted for thy valour. Thy prowess, O king, can be borne by us. It is, therefore, that I say so. O king of Magadha, cast off thy superiority and pride in the presence of those that are thy equals. Go not, O king, with thy children and ministers and army, into the regions of Yama. Damvodhava, Kartavirya, Uttara, and Vrihadratha, were kings that met with destruction, along with all their forces, for having disregarded their superiors. Desirous of liberating the captive monarchs from thee, know that we are certainly not Brahmanas. I am Hrishesha otherwise called Sauri, and these two heroes among men are the sons of Pandu. O king of Magadha, we challenge thee. Fight standing before us. Either set free all the monarchs, or go thou to the abode of Yama.
"Jarasandha said,—'I never make a captive of a king without first vanquishing him. Who hath been kept here that hath not been defeated in war? This, O Krishna, it hath been said, is the duty that should be followed by the Kshatriyas, viz., to bring others under sway by the exhibition of prowess and then to treat them as slaves. Having gathered these monarchs with the intention of offering them as sacrifices unto the god, how shall I, O Krishna, from fear liberate them to-day, when I recollect also the duty I have recited of a Kshatriya? With troops against troops arrayed in order of battle, or alone against one, or against two, or against three, at the same time or separately, I am ready to fight.'" Vaisampayana said,—"Having spoken thus, and desiring to fight with those heroes of terrible achievements, king Jarasandha ordered (his son) Sahadeva to be installed on the throne. Then, O bull of the Bharata race, the king, on the eve of battle, thought of his two generals Kausika and Chitrasena. These two, O king, were formerly called by everybody in the world of men by the respectful appellations of Hansa and Dimvaka. And, O monarch, that tiger among men, the lord Sauri ever devoted to truth, the slayer of Madhu, the younger brother of Haladhara, the foremost of all persons having their senses under complete control, keeping in view the command of Brahma and remembering that the ruler of Magadha was destined to be slain in battle by Bhima and not by the descendant of Madhu (Yadavas), desired not to slay himself king Jarasandha, that foremost of all men endued with strength, that hero possessed of the prowess of a tiger, that warrior of terrible valour."