Exodus 13:10
You are to keep this ordinance at its appointed time from year to year."
Exodus 12:14
""This day is to be a memorial for you, and you are to celebrate it as a festival to the LORD. You are to celebrate it as a perpetual ordinance from generation to generation.
Exodus 12:24-25
You are to observe this event as a perpetual ordinance for you and your children forever.
Exodus 23:15
You are to observe the Festival of Unleavened Bread. As I commanded you, you are to eat unleavened bread for seven days at the appointed time in the month Abib, because in it you came out of Egypt. No one is to appear before me empty handed.
Leviticus 23:6
On the fifteenth day of that month is the Festival of Unleavened Bread to the LORD. For seven days you are to eat unleavened bread.
Deuteronomy 16:3-4
You must not eat any yeast with it. Instead, for seven days eat bread without yeast the bread of affliction because you left the land of Egypt in haste. Remember the day you went out of the land of Egypt for the rest of your lives.