Exodus 12:8

In that night -The night is thus clearly distinguished from the evening when the lamb was slain. It was slain before sunset, on the 14th, and eaten after sunset, the beginning of the 15th. With fire -Among various reasons given for this injunction the most probable and satisfactory seems to be the special sanctity attached to fire from the first institution of sacrifice (compareGenesis 4:4). And unleavened bread -On account of the hasty departure, allowing no time for the process of leavening: but the meaning discerned by Paul,1 Corinthians 5:7-8, and recognized by the Church in all ages, was assuredly implied, though not expressly declared in the original institution.