Exodus 13:10
And thou shalt keep this ordinance at its set time from year to year.
Exodus 12:14
And this day shall be unto you for a memorial; and ye shall celebrate it as a feast to Jehovah; throughout your generations as an ordinance for ever shall ye celebrate it.
Exodus 12:24-25
And ye shall observe this as an ordinance for thee and for thy sons for ever.
Exodus 23:15
Thou shalt keep the feast of unleavened bread, (thou shalt eat unleavened bread seven days, as I have commanded thee, in the time appointed of the month Abib; for in it thou camest out from Egypt; and none shall appear in my presence empty;)
Leviticus 23:6
And on the fifteenth day of this month is the feast of unleavened bread to Jehovah; seven days shall ye eat unleavened bread.
Deuteronomy 16:3-4
Thou shalt eat no leavened bread along with it; seven days shalt thou eat unleavened bread with it, bread of affliction; for thou camest forth out of the land of Egypt in haste, that thou mayest remember the day when thou camest forth out of the land of Egypt, all the days of thy life.