Mahabharata 2.13.65

2.13.65

vayaṃ caiva mahārāja jarāsaṃdhabhayāttadā |
mathurāṃ saṃparityajya gatā dvāravatīṃ purīm || 65 ||

By him have been immured in his hillfort numerous monarchs, like a lion that hath deposited the slain bodies of mighty elephants within a cave of the king of mountains. O slayer of all enemies, king Jarasandha, desirous of offering in sacrifice hundred monarchs, adored for his fierce ascetic penances the illustrious god of gods, the lord of Uma. It is by this means that the kings of the earth have been vanquished by Jarasandha. And, O best of monarchs, he hath by that means been able to fulfil the vow he had made relative to his sacrifice. By defeating the kings with their troops and bringing all of them as captives into this city, he had swelled its crowds enormously. We also, O king, from fear of Jarasandha, at one time had to leave Mathura and fly to the city of Dwaravati. If, O great king, thou desirest to perform this sacrifice, strive to release the kings confined by Jarasandha, as also to compass his death. O son of the Kuru race, otherwise this undertaking of thine can never be completed. O thou foremost of intelligent men if the Rajasuya is to be performed by thee, you must do this in this way and not otherwise. This, O king, is my view (on the matter). Do, O sinless one, as thou thinkest. Under these circumstances, O king, having reflected upon everything, taking note of causes, tell us what thou thyself thinkest proper."