'Unleavened Bread' in the Bible

Thou shalt eat no leavened bread along with it; seven days shalt thou eat unleavened bread with it, 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.

Six days thou shalt eat unleavened bread, and on the seventh day is a solemn assembly to Jehovah thy God; thou shalt do no work.

Three times in the year shall all thy males appear before Jehovah thy God in the place which he will choose, at the feast of unleavened bread, and at the feast of weeks, and at the feast of tabernacles; and they shall not appear before Jehovah empty: