Analysis of information sources in references of the Wikipedia article "Jarasandha" in English language version.
Besides this the Jarasandha had a gifted boon that whenever his body is ripped into two pieces, the two pieces will attach immediately how much how the distance they are thrown apart. Initially, the Bhima tried to kill him by splitting the body but in vain as they were attaching instantly again. So, Krishna gave a hint symbolically with a hay fiber to throw the body parts in mutually opposite directions so that they won't attach again and this was exactly followed by Bhima.