Charles Ellicott 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. —In the case of all other victims, the limbs were to be separated from the body. Here the victim was to be roasted whole, and to remain whole, as a symbol of unity, and a type of Him through whom men are brought into unity with each other and with God. (See John 19:33-36.)