10 You shall therefore keep this ordinance in its season from year to year.
Exodus 13:10 Cross References - WEB
Exodus 12:14
14 This day shall be a memorial for you. You shall keep it as a feast to Yahweh. You shall keep it as a feast throughout your generations by an ordinance forever.
Exodus 12:24-25
Exodus 23:15
15 You shall observe the feast of unleavened bread. Seven days you shall eat unleavened bread, as I commanded you, at the time appointed in the month Abib (for in it you came out of Egypt), and no one shall appear before me empty.
Leviticus 23:6
6 On the fifteenth day of the same month is the feast of unleavened bread to Yahweh. Seven days you shall eat unleavened bread.
Deuteronomy 16:3-4
3 You shall eat no leavened bread with it. You shall eat unleavened bread with it seven days, even the bread of affliction (for you came out of the land of Egypt in haste) that you may remember the day when you came out of the land of Egypt all the days of your life.
4 No yeast shall be seen with you in all your borders seven days; neither shall any of the meat, which you sacrifice the first day at evening, remain all night until the morning.