Leviticus 6:17 in the King James Version
It shall not be baken with leaven. I have given it unto them for their portion of my offerings made by fire; it is most holy, as is the sin offering, and as the trespass offering.
Context
16 That which is left of it Aaron and his sons shall eat. It shall be eaten without yeast in a holy place. They shall eat it in the court of the Tent of Meeting.
17 It shall not be baked with yeast. I have given it as their portion of my offerings made by fire. It is most holy, as are the sin offering and the trespass offering.
18 Every male among the children of Aaron shall eat of it, as their portion forever throughout your generations, from the offerings of the LORD made by fire. Whoever touches them shall be holy.’”