And this day shall be unto you for a memorial, and ye shall keep it a feast to the LORD; throughout your generations ye shall keep it a feast by an ordinance for ever.
Exodus 13:3 repeats the command to remember:
Remember this day, in which you came out of Egypt, out of the house of bondage, for by strength the hand of the LORD brought you out from this place.
For I have received of the Lord that which also I delivered unto you, that the Lord Jesus the same night in which he was betrayed took bread: And when he had given thanks, he brake it, and said, Take, eat: this is my body, which is broken for you: this do in remembrance of me. After the same manner also he took the cup, when he had supped, saying, this cup is the new testament in my blood: this do ye, as oft as ye drink it, in remembrance of me. For as often as ye eat this holy bread, and drink this holy cup, ye do shew the Lord's death till he come.(1 Corinthians 11:23-26)