'Unleavened' in the Bible

a basket of unleavened bread made from choice flour, cakes mixed with oil, a wafer of unleavened bread smeared with oil, along with grain and drink offerings.

He is to offer the ram, a sacrifice of peace offering to the LORD, along with the basket of unleavened bread. Then the priest is to present his grain and drink offerings.

Then the priest is to take the boiled shoulder of the ram, one cake of unleavened bread from the basket, and one wafer of unleavened bread. He is to place them in the hands of the Nazirite, after he himself has shaved his symbol of consecration.

On the fourteenth day of the second month at twilight, they are to eat it with unleavened bread and bitter herbs.

You are to hold a festival on the fifteenth day of this month for seven days, during which time unleavened bread is to be eaten."