Exodus 13:10
And watch this law according to its appointment from days to days.
Exodus 12:14
And this day shall be to you for a remembrance; and ye kept it a festival to Jehovah for your generations: ye shall keep a festival a law forever.
Exodus 12:24-25
And watch ye this word for a law to thee and to thy sons forever.
Exodus 23:15
Thou shalt watch the festival of unleavened: seven days shalt thou eat unleavened as I commanded thee according to the appointment of the month Abib; for in it thou camest forth out of Egypt: and they shall not be seen before me empty.
Leviticus 23:6
And in the fifteenth day of that month the festival of unleavened to Jehovah: seven days shall ye eat unleavened.
Deuteronomy 16:3-4
Thou shalt not eat upon it leavened; seven days thou shalt eat upon it unleavened, the bread of affliction; (for in hasty flight thou camest forth out of the land of Egypt) so that thou shalt remember the day of thy coming forth from the land of Egypt all the days of thy life,