Albert Barnes Commentary Exodus 12:14

"And this day shall be unto you for a memorial, and ye shall keep it a feast to Jehovah: throughout your generations ye shall keep it a feast by an ordinance for ever." — Exodus 12:14 (ASV)

A memorial - A commemorative and sacramental ordinance of perpetual obligation. As such, it has always been observed by the Hebrews. By the Christian it is spiritually observed; its full significance is recognized, and all that it foreshadowed is realized, in the sacrament of holy communion.