Albert Barnes 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)

In one house - i.e., “in one company.” Each lamb was to be entirely consumed by the members of one company, whether they belonged to the same household or not.

Break a bone - The typical significance of this injunction is recognized by John, (see the marginal reference). It is not easy to assign any other satisfactory reason for it. This victim alone was exempt from the general law by which the limbs were ordered to be separated from the body.