'Unleavened' in the Bible

"'When you offer an offering of a meal offering baked in the oven, it shall be unleavened cakes of fine flour mixed with oil, or unleavened wafers anointed with oil.

If your offering is a meal offering of the griddle, it shall be of unleavened fine flour, mixed with oil.

If he offers it for a thanksgiving, then he shall offer with the sacrifice of thanksgiving unleavened cakes mixed with oil, and unleavened wafers anointed with oil, and cakes mixed with oil.

"Take Aaron and his sons with him, and the garments, and the anointing oil, and the bull of the sin offering, and the two rams, and the basket of unleavened bread;

and out of the basket of unleavened bread, that was before Yahweh, he took one unleavened cake, and one cake of oiled bread, and one wafer, and placed them on the fat, and on the right thigh.

On the fifteenth day of the same month is the feast of unleavened bread to Yahweh. Seven days you shall eat unleavened bread.