Exodus 12:15

12:15 For seven days you must eat bread made without yeast. Surely on the first day you must put away yeast from your houses because anyone who eats bread made with yeast from the first day to the seventh day will be cut off from Israel.

Exodus 13:6

13:6 For seven days you must eat bread made without yeast, and on the seventh day there is to be a festival to the Lord.

Leviticus 23:6

23:6 Then on the fifteenth day of the same month will be the festival of unleavened bread to the Lord; seven days you must eat unleavened bread.

Numbers 28:16-17

Passover and Unleavened Bread

28:16 “‘On the fourteenth day of the first month is the Lord’s Passover. 28:17 And on the fifteenth day of this month is the festival. For seven days bread made without yeast must be eaten.

Deuteronomy 16:16

16:16 Three times a year all your males must appear before the Lord your God in the place he chooses for the Festival of Unleavened Bread, the Festival of Weeks, and the Festival of Temporary Shelters; and they must not appear before him empty-handed.

Isaiah 25:6

25:6 The Lord who commands armies will hold a banquet for all the nations on this mountain.

At this banquet there will be plenty of meat and aged wine –

tender meat and choicest wine.