'Unleavened' in the Bible

even as the duty of every day required, offering according to the commandment of Moses, on the Sabbaths, and on the new moons, and on the set feasts, three times in the year, [even] in the feast of unleavened bread, and in the feast of weeks, and in the feast of tents.

Many people assembled at Jerusalem to keep the feast of unleavened bread in the second month, a very great assembly.

The children of Israel who were present at Jerusalem kept the feast of unleavened bread seven days with great gladness; and the Levites and the priests praised Yahweh day by day, [singing] with loud instruments to Yahweh.

The children of Israel who were present kept the Passover at that time, and the feast of unleavened bread seven days.