Exodus 12:15
Seven days shall you eat unleavened bread; even the first day you shall put away leaven out of your houses: for whoever eats leavened bread from the first day until the seventh day, that soul shall be cut off from Israel.
Torrey's Topical Textbook—AKJV

Deuteronomy 16:3
You shall eat no leavened bread with it; seven days shall you eat unleavened bread therewith, even the bread of affliction; for you came forth out of the land of Egypt in haste: that you may remember the day when you came forth out of the land of Egypt all the days of your life.
Torrey's Topical Textbook—AKJV