UNLEAVENED BREAD WAS USED FOR SANCTIFICATION

Exodus 29:1 And this is the thing that you shall do unto them to hallow <06942> them, to minister unto me in the priest's office: Take one young bullock, and two rams without blemish,

Exodus 29:2 And unleavened bread, and cakes unleavened tempered with oil, and wafers unleavened anointed with oil: of wheaten flour shall you make them.