Leviticus 6:17

6:17 It must not be baked with yeast. I have given it as their portion from my gifts. It is most holy, like the sin offering and the guilt offering.

Leviticus 23:17

23:17 From the places where you live you must bring two loaves of bread for a wave offering; they must be made from two tenths of an ephah of fine wheat flour, baked with yeast, as first fruits to the Lord.