Leviticus 23:6

23:6 Then on the fifteenth day of the same month will be the festival of unleavened bread to the Lord; seven days you must eat unleavened bread.

Leviticus 2:4

Processed Grain Offerings

2:4 “‘When you present an offering of grain baked in an oven, it must be made of choice wheat flour baked into unleavened loaves mixed with olive oil or unleavened wafers smeared with olive oil.

Leviticus 8:26

8:26 and from the basket of unleavened bread that was before the Lord he took one unleavened loaf, one loaf of bread mixed with olive oil, and one wafer, and placed them on the fat parts and on the right thigh.