Eat not of it raw. The injunction appears to moderns superfluous; but an ὠμοφαγία, or eating of the raw flesh of victims sacrificed, seems to have been practised by several heathen nations in ancient times, more especially in the worship of Dionysus or Bacchus.
Its head with its legs. The lamb was to be roasted whole—according to some, as a symbol of the unity of Israel, and especially of the political unit which they were to become so soon as they quitted Egypt; but, as we learn from St.
John (John 19:36), still more to prefigure the unbroken body of Him whom the lamb especially represented, the true propitiation and atonement and deliverer of His people from the destroyer, our Lord Jesus Christ.
The purtenance thereof. Rather, "the intestines thereof." The Jewish commentators say that the intestines were first taken out, washed, and cleansed, after which they were replaced, and the lamb roasted in a sort of oven.