'Unleavened' in the Bible

"When you bring an offering that is, a grain offering baked in an oven it is to consist of fine flour baked into unleavened bread mixed with olive oil or of wafers made of unleavened bread and smeared with olive oil.

Aaron and his sons are to eat what remains of the unleavened offering at this sacred place the court of the Tent of Meeting.

If someone brings it to demonstrate thanksgiving, then he is to present along with the thanksgiving offering unleavened cakes mixed with olive oil, unleavened wafers spread with olive oil, and cakes of mixed fine flour with olive oil.

Along with the cakes of unleavened bread, he is to bring his thanksgiving offering with his peace offerings.

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

From the basket of unleavened bread that is in the LORD'S presence he took one piece of unleavened bread, one cake spread with olive oil, and one wafer, which he placed over the fat and the right thigh.

Then Moses told Aaron and his sons Eleazar and Ithamar, "Take the leftovers from the grain offering and the offerings made by fire and eat the unleavened bread beside the altar, because it is most holy to the LORD.

On the fifteenth day of that month is the Festival of Unleavened Bread to the LORD. For seven days you are to eat unleavened bread.