Exodus 12:15-16

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.

12:16 On the first day there will be a holy convocation, and on the seventh day there will be a holy convocation for you. You must do no work of any kind on them, only what every person will eat – that alone may be prepared for you.

Exodus 13:7-8

13:7 Bread made without yeast must be eaten for seven days; no bread made with yeast shall be seen among you, and you must have no yeast among you within any of your borders.

13:8 You are to tell your son on that day, ‘It is because of what the Lord did for me when I came out of Egypt.’

Leviticus 23:6-8

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. 23:7 On the first day there will be a holy assembly for you; you must not do any regular work. 23:8 You must present a gift to the Lord for seven days, and the seventh day is a holy assembly; you must not do any regular work.’”

Numbers 28:17-19

28:17 And on the fifteenth day of this month is the festival. For seven days bread made without yeast must be eaten. 28:18 And on the first day there is to be a holy assembly; you must do no ordinary work on it.

28:19 “‘But you must offer to the Lord an offering made by fire, a burnt offering of two young bulls, one ram, and seven lambs one year old; they must all be unblemished.