Exodus 13:10
Thou shalt, therefore, keep this ordinance in its season from year to year.
Exodus 12:14
And this day shall be unto you for a memorial; and ye shall keep it as a feast unto the LORD throughout your ages; ye shall keep it a feast by an ordinance forever.
Exodus 12:24-25
And ye shall observe this thing for an ordinance to thee and to thy sons forever.
Exodus 23:15
Thou shalt keep the feast of unleavened bread (thou shalt eat unleavened bread seven days as I commanded thee, in the time appointed of the month Abib, for in it thou didst come out from Egypt; and none shall appear before me empty),
Leviticus 23:6
And on the fifteenth day of the same month is the feast of unleavened bread unto the LORD; seven days ye must eat unleavened bread.
Deuteronomy 16:3-4
Thou shalt eat no leavened bread with it; seven days shalt thou eat unleavened bread therewith, even the bread of affliction; for thou didst come forth out of the land of Egypt in haste; that thou may remember the day when thou didst come forth out of the land of Egypt all the days of thy life.