Mahabharata 2.13.34

2.13.34

bhaye tu samupakrānte jarāsaṃdhe samudyate |
mantro'yaṃ mantrito rājankulairaṣṭādaśāvaraiḥ || 34 ||

And, O exalted one, the eighteen tribes of the Bhojas, from fear of Jarasandha, have all fled towards the west; so also have the Surasenas, the Bhadrakas, the Vodhas, the Salwas, the Patachchavas, the Susthalas, the Mukuttas, and the Kulindas, along with the Kuntis. And the king of the Salwayana tribe with their brethren and followers; and the southern Panchalas and the eastern Kosalas have all fled to the country of the Kuntis. So also the Matsyas and the Sannyastapadas, overcome with fear, leaving their dominions in the north, have fled into the southern country. And so all the Panchalas, alarmed at the power of Jarasandha, have left their own kingdom and fled in all directions. Some time before, the foolish Kansa, having persecuted the Yadavas, married two of the daughters of Jarasandha. They are called Asti and Prapti and are the sister of Sahadeva. Strengthened by such an alliance, the fool persecuting his relatives gained an ascendency over them all. But by this conduct he earned great obloquy. The wretch also began to oppress the old kings of the Bhoja tribe, but they, to protect themselves from the persecution of their relative, sought our help. Having bestowed upon Akrura the handsome daughter of Ahuka, with Sankarshana as my second I did a service to my relatives, for both Kansa and Sunaman were slain by me assisted by Rama. But after the immediate cause of fear was removed (by the death of Kansa), Jarasandha, his father-in-law, took up arms.

Ourselves consisting of the eighteen younger branches of the Yadavas arrived at the conclusion that even if we struck our enemies continually with excellent weapons capable of taking the lives of the foes, we should still be unable to do anything unto him even in three hundred years. He hath two friends that are like unto the immortals, and in point of strength the foremost of all men endued with might. They are called Hansa and Dimvaka who are both incapable of being slain by weapons. The mighty Jarasandha, being united with them, becomes incapable, I think, of being vanquished by even the three worlds. O thou foremost of all intelligent men, this is not our opinion alone but all other kings also are of the same mind. There lived, O monarch, a king of the name of Hansa, who was slain by Rama (Valadeva) after a battle of eighteen days. But, O Bharata, hearing people say that Hansa had been killed, Dimvaka, O king, thought that he could not live without Hansa. He accordingly jumped into the waters of the Yamuna and killed himself. Afterwards when Hansa, the subjugator of hostile heroes, heard that Dimvaka, had killed himself, he went to the Yamuna and jumped into its waters. Then, O bull of the Bharata race, king Jarasandha, hearing that both Hansa and Dimvaka had been killed, returned to his kingdom with an empty heart. After Jarasandha had returned, O slayer of all foes, we were filled with pleasure and continued to live at Mathura.