'Unleavened' in the Bible

‘When you bring an offering of grain baked in the oven, it shall be unleavened cakes of fine flour mixed with oil, or unleavened wafers spread with oil.

If your offering is grain baked on a griddle, it shall be of fine unleavened flour, mixed with oil.

If one offers it as a sacrificial meal of thanksgiving, then along with the sacrifice of thanksgiving he shall offer unleavened cakes mixed with oil, and unleavened wafers spread with oil, and cakes of fine flour mixed with oil.

“Take Aaron and his sons with him, and the garments [which are symbols of their office], and the anointing oil, and the bull for the sin offering, and the two rams, and the basket of unleavened bread;

and from the basket of unleavened bread that was before the Lord, he took one unleavened cake, a cake of oiled bread, and one wafer and put them on the fat and on the right thigh;

The Feast of Unleavened Bread to the Lord is on the fifteenth day of the same month; for seven days you shall eat unleavened bread.