Exodus 13:10
So let this order be kept, at the right time, from year to year.
Exodus 12:14
And this day is to be kept in your memories: you are to keep it as a feast to the Lord through all your generations, as an order for ever.
Exodus 12:24-25
And you are to keep this as an order to you and to your sons for ever.
Exodus 23:15
You are to keep the feast of unleavened bread; for seven days let your bread be without leaven, as I gave you orders, at the regular time in the month Abib (for in it you came out of Egypt); and let no one come before me without an offering:
Leviticus 23:6
And on the fifteenth day of the same month is the feast of unleavened bread; for seven days let your food be unleavened bread.
Deuteronomy 16:3-4
Take no leavened bread with it; for seven days let your food be unleavened bread, that is, the bread of sorrow; for you came out of the land of Egypt quickly: so the memory of that day, when you came out of the land of Egypt, will be with you all your life.