'Unleavened' in the Bible

Even after a certain rate every day, offering according to the commandment of Moses, on the sabbaths, and on the new moons, and on the solemn feasts, three times in the year, even in the feast of unleavened bread, and in the feast of weeks, and in the feast of tabernacles.

And there assembled at Jerusalem much people to keep the feast of unleavened bread in the second month, a very great congregation.

And the children of Israel that were present at Jerusalem kept the feast of unleavened bread seven days with great gladness: and the Levites and the priests praised the LORD day by day, singing with loud instruments unto the LORD.

And the children of Israel that were present kept the passover at that time, and the feast of unleavened bread seven days.