And they shall eat the flesh in that night, roast with fire, and unleavened bread; and with bitter herbs they shall eat it. They shall eat the flesh - roast with fire - As it was the ordinary custom of the Jews to boil their flesh, some think that the command given here was in opposition to the custom of the Egyptians, who ate raw flesh in honor of Osiris. The Ethiopians are to this day remarkable for eating raw flesh, as is the case with most savage nations.
Unleavened bread - מצות matstsoth, from מצה matsah, to squeeze or compress, because the bread prepared without leaven or yeast was generally compressed, sad or heavy, as we term it. The word here properly signifies unleavened cakes; the word for leaven in Hebrew is חמץ chamets, which simply signifies to ferment. It is supposed that leaven was forbidden on this and other occasions, that the bread being less agreeable to the taste, it might be emblematical of their bondage and bitter servitude, as this seems to have been one design of the bitter herbs which were commanded to be used on this occasion; but this certainly was not the sole design of the prohibition: leaven itself is a species of corruption, being produced by fermentation, which in such cases tends to putrefaction. In this very light St. Paul considers the subject in this place; hence, alluding to the passover as a type of Christ, he says: Purge out therefore the old leaven - for Christ our passover is sacrificed for us: therefore let us keep the feast, not with old leaven, neither with the leaven of malice and wickedness, but with the unleavened bread of sincerity and truth; 1 Corinthians 5:6-8.
Bitter herbs - What kind of herbs or salad is intended by the word מררים merorim, which literally signifies bitters, is not well known. The Jews think chicory, wild lettuce, horehound, and the like are intended. Whatever may be implied under the term, whether bitter herbs or bitter ingredients in general, it was designed to put them in mind of their bitter and severe bondage in the land of Egypt, from which God was now about to deliver them.