Exodus 13:10
You shall therefore keep this statute at its appointed time from year to year.
Exodus 12:14
"This day shall be for you a memorial day, and you shall keep it as a feast to the LORD; throughout your generations, as a statute forever, you shall keep it as a feast.
Exodus 12:24-25
You shall observe this rite as a statute for you and for your sons forever.
Exodus 23:15
You shall keep the Feast of Unleavened Bread. As I commanded you, you shall eat unleavened bread for seven days at the appointed time in the month of Abib, for in it you came out of Egypt. None shall appear before me empty-handed.
Leviticus 23:6
And on the fifteenth day of the same month is the Feast of Unleavened Bread to the LORD; for seven days you shall eat unleavened bread.
Deuteronomy 16:3-4
You shall eat no leavened bread with it. Seven days you shall eat it with unleavened bread, the bread of affliction--for you came out of the land of Egypt in haste--that all the days of your life you may remember the day when you came out of the land of Egypt.