6 And on the fifteenth day of the same month is the feast of unleavened bread unto theYeHoVaH: seven days ye must eat unleavened bread. 7 In the first day ye shall have an holy convocation: ye shall do no servile work therein. 8 But ye shall offer an offering made by fire unto the YeHoVaH seven days: in the seventh day is an holy convocation: ye shall do no servile work therein. Leviticus 23:6-8

3 Thou shalt eat no leavened bread with it; seven days shalt thou eat unleavened bread therewith, even the bread of affliction; for thou camest forth out of the land of Egypt in haste: that thou mayest remember the day when thou camest forth out of the land of Egypt all the days of thy life.4  And there shall be no leavened bread seen with thee in all thy coast seven days; neither shall there anything of the flesh, which thou sacrificedst the first day at even, remain all night until the morning. 
8 Six days thou shalt eat unleavened bread: and on the seventh day shall be a solemn assembly to the LORD thy God: thou shalt do no work therein.
Deuteronomy 16:3,4 & 8