Matthew Poole and continuators on Exodus 12:14

14 And this day shall be unto you for a memorial: and you shall keep it a feast to the LORD throughout your generations: you shall keep it a feast by an ordinance for ever.

Or, Monument, both of this deliverance from Egypt, and moreover of your redemption by Christ, of which that is a Type, as even the antient Iews 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 moneth 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.

(i. e.) So long as your state and Church continues, or till the coming of the Messias. This word doth not always signifie eternity, but any long time, as Prov. 29. 14. Dan. 3. 9. and oft elsewhere.