Parallel
Exodus 12:17
Brenton's English Septuagint · Berean Standard Bible
And ye shall keep this commandment, for on this day will I bring out your force out of the land of Egypt; and ye shall make this day a perpetual ordinance for you throughout your generations.
So you are to keep the Feast of Unleavened Bread (note: That is, the seven-day period after the Passover during which no leaven may be eaten), for on this very day I brought your divisions out of the land of Egypt. You must keep this day as a permanent statute for the generations to come.