Exodus 12:46
In one house shall it be eaten; thou shalt not carry forth ought of the flesh abroad out of the house; neither shall ye break a bone thereof. In one house shall it be eaten; thou shalt not carry forth ought of the flesh abroad out of the house; neither shall ye break a bone thereof.
The Passover lamb was to be prepared and eaten whole, with not a bone of it broken. That prohibition pointed forward to Jesus as the Lamb of God who was to die for humanity. At the crucifixion the legs of the two thieves crucified with Him were broken to hasten their death, but Jesus was already dead and so His limbs were left unbroken. In that preservation the law of the Passover was fulfilled, marking Him as the perfect Passover Lamb offered for humanity and representing the completeness of His sacrifice.