Numbers 28:17

On the fifteenth day of this month [is] a religious feast, unleavened bread must be eaten for seven days.

Leviticus 23:6

And on the fifteenth day of this month [is] Yahweh's Feast of Unleavened Bread; [for] seven days you shall eat unleavened bread.

Exodus 12:15-17

You will eat unleavened bread for seven days. Surely on the first day you shall remove yeast from your houses, because anyone [who] eats [food with] yeast from the first day until the seventh day--that person will be cut off from Israel.

Exodus 13:6

Seven days you will eat unleavened bread, and on the seventh day [will be] a feast for Yahweh.

Exodus 23:15

You will keep the Feast of Unleavened Bread; for seven days you will eat unleavened bread, as I commanded you at [the] appointed time, the month of Abib, because in it you came out from Egypt, and {no one will} appear before me empty-handed.

Exodus 34:18

"You will keep the Feast of Unleavened Bread. Seven days you will eat unleavened bread, which I commanded you, at the appointed time of the month of Abib, for in the month of Abib you came out from Egypt.

Deuteronomy 16:3-8

You shall not eat {with it} anything leavened; seven days you shall eat {with it} unleavened bread of affliction, because in haste you went out from the land of Egypt, so that you will remember the day of your going out from the land of Egypt all the days of your life.

Treasury of Scripture Knowledge

Summary

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

Bible References

General references

Exodus 12:15
You will eat unleavened bread for seven days. Surely on the first day you shall remove yeast from your houses, because anyone [who] eats [food with] yeast from the first day until the seventh day--that person will be cut off from Israel.
Exodus 13:6
Seven days you will eat unleavened bread, and on the seventh day [will be] a feast for Yahweh.
Leviticus 23:6
And on the fifteenth day of this month [is] Yahweh's Feast of Unleavened Bread; [for] seven days you shall eat unleavened bread.