Lord Krishna Blesses the Liberated Kings

Krishna, after

1. causing Jarasandha's death 
2. took his car furnished with an excellent flagstaff to be made ready and 
3. making the brothers (Bhima and Arjuna) ride in it, went in and released imprisoned kings And 

those kings rescued from terrible fate, rich in the possession of jewels, approaching Krishna made presents unto him of jewels and gems.

http://www.srimadbhagavatam.org/canto10/chapter73.html
http://www.srimadbhagavatamclass.com/category/srimad-bhagavatam-canto-10-the-summum-bonum/chapter-73-lord-krishna-blesses-the-liberated-kings/

Note
After his death, the Pandavas released all the 95 kings imprisoned by Jarasandha and crowned his son, Sahdeva as the king of Magadha. Thus, these 95 kings along with Sahdeva, the new ruler of Magadha became an ally of Pandavas who took part in the great Mahabharat war later.

http://www.sacred-texts.com/hin/m02/m02022.htm