'Unleavened' in the Bible

even by the matter of a day in its day, to cause to ascend according to the command of Moses, on sabbaths, and on new moons, and on appointed seasons, three times in a year -- in the feast of unleavened things, and in the feast of weeks, and in the feast of booths.

and much people are gathered to Jerusalem, to make the feast of unleavened things in the second month -- a mighty assembly for multitude.

And the sons of Israel, those found in Jerusalem, make the feast of unleavened things seven days with great joy; and giving praise to Jehovah day by day are the Levites and the priests, with instruments of praise before Jehovah.

And the sons of Israel who are found make the passover at that time, and the feast of unleavened things, seven days.