'Unleavened' in the Bible

You shall eat no leavened bread with it. You shall eat unleavened bread with it seven days, even the bread of affliction; for you came forth out of the land of Egypt in haste: that you may remember the day when you came forth out of the land of Egypt all the days of your life.

Six days you shall eat unleavened bread; and on the seventh day shall be a solemn assembly to Yahweh your God; you shall do no work [therein].

Three times in a year shall all your males appear before Yahweh your God in the place which he shall choose: in the feast of unleavened bread, and in the feast of weeks, and in the feast of tents; and they shall not appear before Yahweh empty: