They shall leave none of it unto the morning, nor break any bone of it:
according to all the ordinances of the passover they shall keep it.
Numbers 9:12
But when they came to Jesus, and saw that he was dead already,
they brake not his legs:
John 19:33
Some "Scholars" suggest that the reason for the bones not being broken is that it is symbolic of resurrection. There is also a Jewish tradition that alludes to this.