Exodus 12:46

Neither shall ye break a bone thereof. This precept shows clearly that the Passover lamb was a type of Christ, and that it was understood as such in the early Christian church is clear from John 19:33, 36. Although the Lamb of God that takes away the sin of the world was crucified as a common criminal, none of His bones were broken, in spite of the fact that it was the usual custom to do so. This was done to His two companions. Just as the crucified Antitype was treated differently from other crucified men, so was the Passover lamb prepared differently. The bones of other lambs eaten during the year might be broken to extract the marrow.