What mean ye by this service? - The establishment of this service annually was a very wise provision to keep up in remembrance this wonderful deliverance. From the remotest antiquity the institution of feasts, games, etc., has been used to keep up the memory of past grand events. Hence God instituted the Sabbath, to keep up the remembrance of the creation; and the passover to keep up the remembrance of the deliverance from Egypt. All the other feasts were instituted on similar reasons. The Jews never took their sons to the tabernacle or temple till they were twelve years of age, nor suffered them to eat of the flesh of any victim till they had themselves offered a sacrifice at the temple, which they were not permitted to do before the twelfth year of their age. It was at this age that Joseph and Mary took our blessed Lord to the temple, probably for the first time, to offer his sacrifice. See Calmet.

And it shall come to pass, when your children shall say unto you, what mean ye by this service? Of killing and roasting a lamb, and eating it with bitter herbs, and of abstaining from leavened bread.

when your children shall say, . . . What mean ye by this service--Independently of some observances which were not afterwards repeated, the usages practised at this yearly commemorative feast were so peculiar that the curiosity of the young would be stimulated, and thus parents had an excellent opportunity, which they were enjoined to embrace, for instructing each rising generation in the origin and leading facts of the national faith.