John Calvin Commentary Exodus 12:46

"In one house shall it be eaten; thou shalt not carry forth aught of the flesh abroad out of the house; neither shall ye break a bone thereof." — Exodus 12:46 (ASV)

Neither shall ye break a bone thereof. I am not certain why God desired no bone to be broken, unless perhaps this might also be a sign of haste, because people at table seldom partake of the marrow unless when their meal is prolonged. For I fear there is too much subtlety in the explanation which some give: that the virtue of Christ, which is represented by the bones, is not diminished while we feed on His flesh. But the former opinion, which I have mentioned above, as it is the simplest, is also by no means unsuitable here: that they were commanded, when they were standing in readiness for their journey and eating hurriedly, to burn the bones in order to prevent all delay.

What God commanded concerning the lamb, He chose to have openly fulfilled in the person of His only-begotten Son, so that the truth corresponding with its type, and the substance with its shadow, might show that God would be reconciled to His people by no other blood than Christ’s. From this it is again clear that the ancients under the Law were instructed by the Paschal Lamb about the future redemption, for otherwise this passage could not have been properly applied to Christ. But when the Evangelist quotes it (John 19:33), he takes it for granted that in this way it was typically shown what God would bestow through His Son. Consequently, it happened that He was distinguished by this visible mark, which proved Him to be the true Passover.

But, so that no bone of Christ’s should be broken, God’s providence wonderfully intervened. The soldiers were commanded to hasten the death of Christ, no less than that of the robbers, by breaking their bones. They executed their intention on the robbers, but to prevent them from attempting the same on Christ, it is certain that they were restrained by a divine power, so that the wholeness of His bones might be a presage of the approaching redemption.