Exodus 12:14 - Matthew Poole's English Annotations on the Holy Bible

For a memorial, or monument, both of this deliverance from Egypt, and moreover of your redemption by Christ, of which that is a type, as even the ancient Jews understood it, who also noted that Israel was to be redeemed in the days of the Messias upon the same day on which they were delivered from Egypt, to wit, upon the fifteenth day of the month of Nisan. Upon which day our blessed Lord was crucified for the redemption of his people. You shall observe it for a solemn feast or festival time. For ever, i.e. so long as your state and church continues, or till the coming of the Messias. This word doth not always signify eternity, but any long time, as Proverbs 29:14 Daniel 3:9, and oft elsewhere.