'Unleavened' in the Bible

and a basket of unleavened bread, cakes of fine flour mixed with oil, and unleavened wafers anointed with oil, and their meal offering, and their drink offerings.

He shall offer the ram for a sacrifice of peace offerings to Yahweh, with the basket of unleavened bread. The priest shall offer also its meal offering, and its drink offering.

The priest shall take the boiled shoulder of the ram, and one unleavened cake out of the basket, and one unleavened wafer, and shall put them on the hands of the Nazirite, after he has shaved the head of his separation;

In the second month, on the fourteenth day at evening they shall keep it; they shall eat it with unleavened bread and bitter herbs.

On the fifteenth day of this month shall be a feast: seven days shall unleavened bread be eaten.