Numbers 28:17

and in the fifteenth day of this month is a festival, seven days unleavened food is eaten;

Leviticus 23:6

and on the fifteenth day of this month is the feast of unleavened things to Jehovah; seven days unleavened things ye do eat;

Exodus 12:15-17

Seven days ye eat unleavened things; only -- in the first day ye cause leaven to cease out of your houses; for any one eating anything fermented from the first day till the seventh day, even that person hath been cut off from Israel.

Exodus 13:6

Seven days thou dost eat unleavened things, and in the seventh day is a feast to Jehovah;

Exodus 23:15

the Feast of Unleavened things thou dost keep; seven days thou dost eat unleavened things, as I have commanded thee, at the time appointed in the month of Abib; for in it thou hast come forth out of Egypt, and ye do not appear in My presence empty;

Exodus 34:18

'The feast of unleavened things thou dost keep; seven days thou dost eat unleavened things, as I have commanded thee, at an appointed time, the month of Abib: for in the month of Abib thou didst come out from Egypt.

Deuteronomy 16:3-8

'Thou dost not eat with it any fermented thing, seven days thou dost eat with it unleavened things, bread of affliction; for in haste thou hast come out of the land of Egypt; so that thou dost remember the day of thy coming out of the land of Egypt all days of thy 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
Seven days ye eat unleavened things; only -- in the first day ye cause leaven to cease out of your houses; for any one eating anything fermented from the first day till the seventh day, even that person hath been cut off from Israel.
Exodus 13:6
Seven days thou dost eat unleavened things, and in the seventh day is a feast to Jehovah;
Leviticus 23:6
and on the fifteenth day of this month is the feast of unleavened things to Jehovah; seven days unleavened things ye do eat;