On the fifteenth day of this month, there shall be a feast; for seven days unleavened bread is to be eaten.

Exodus 12:15
For seven days you must eat unleavened bread. On the first day you are to remove the leaven from your houses. Whoever eats anything leavened from the first day through the seventh must be cut off from Israel.

Exodus 23:15
You are to keep the Feast of Unleavened Bread as I commanded you: At the appointed time in the month of Abib you are to eat unleavened bread for seven days, because that was the month you came out of Egypt. No one may appear before Me empty-handed.

Exodus 34:18
You are to keep the Feast of Unleavened Bread. For seven days at the appointed time in the month of Abib, you are to eat unleavened bread as I commanded you. For in the month of Abib you came out of Egypt.

Leviticus 23:6
On the fifteenth day of the same month begins the Feast of Unleavened Bread to the LORD. For seven days you must eat unleavened bread.

Deuteronomy 16:3
You must not eat leavened bread with it; for seven days you are to eat with it unleavened bread, the bread of affliction, because you left the land of Egypt in haste--so that you may remember for the rest of your life the day you left the land of Egypt.

And in the fifteenth day of this month is the feast: seven days shall unleavened bread be eaten.